The History of Gravity and Aristotle

The History of Gravity and Aristotle One of the most pervasive behaviors that we experience, its no wonder that even the earliest scientists tried to understand why objects fall toward the ground. The Greek philosopher Aristotle gave one of the earliest and most comprehensive attempts at a scientific explanation of this behavior by putting forth the idea that objects moved toward their natural place. This natural place for the element of Earth was in the center of the Earth (which was, of course, the center of the universe in Aristotles geocentric model of the universe). Surrounding the Earth was a concentric sphere that was the natural realm of water, surrounded by the natural realm of air, and then the natural realm of fire above that. Thus, Earth sinks in water, water sinks in the air, and flames rise above air. Everything gravitates toward its natural place in Aristotles model, and it comes across as fairly consistent with our intuitive understanding and basic observations about how the world works. Aristotle further believed that objects fall at a speed that is proportional to their weight. In other words, if you took a wooden object and a metal object of the same size and dropped them both, the heavier metal object would fall at a proportionally faster speed. Galileo and Motion Aristotles philosophy about motion toward a substances natural place held sway for about 2,000 years, until the time of Galileo Galilei. Galileo conducted experiments rolling objects of different weights down inclined planes (not dropping them off the Tower of Pisa, despite the popular apocryphal stories to this effect), and found that they fell with the same acceleration rate regardless of their weight. In addition to the empirical evidence, Galileo also constructed a theoretical thought experiment to support this conclusion. Here is how the modern philosopher describes Galileos approach in his 2013 book Intuition Pumps and Other Tools for Thinking: Some thought experiments are analyzable as rigorous arguments, often of the form reductio ad absurdum, in which one takes ones opponents premises and derives a formal contradiction (an absurd result), showing that they cant all be right. One of my favorites is the proof attributed to Galileo that heavy things dont fall faster than lighter things (when friction is negligible). If they did, he argued, then since heavy stone A would fall faster than light stone B, if we tied B to A, stone B would act as a drag, slowing A down. But A tied to B is heavier than A alone, so the two together should also fall faster than A by itself. We have concluded that tying B to A would make something that fell both faster and slower than A by itself, which is a contradiction. Newton Introduces Gravity The major contribution developed by Sir Isaac Newton was to recognize that this falling motion observed on Earth was the same behavior of motion that the Moon and other objects experience, which holds them in place within relation to each other. (This insight from Newton was built upon the work of Galileo, but also by embracing the heliocentric model and Copernican principle, which had been developed by Nicholas Copernicus prior to Galileos work.) Newtons development of the law of universal gravitation, more often called the law of gravity, brought these two concepts together in the form of a mathematical formula that seemed to apply to determine the force of attraction between any two objects with mass. Together with Newtons laws of motion, it created a formal system of gravity and motion that would guide scientific understanding unchallenged for over two centuries. Einstein Redefines Gravity The next major step in our understanding of gravity comes from Albert Einstein, in the form of his general theory of relativity, which describes the relationship between matter and motion through the basic explanation that objects with mass actually bend the very fabric of space and time (collectively called spacetime). This changes the path of objects in a way that is in accord with our understanding of gravity. Therefore, the current understanding of gravity is that it is a result of objects following the shortest path through spacetime, modified by the warping of nearby massive objects. In the majority of cases that we run into, this is in complete agreement with Newtons classical law of gravity. There are some cases which require the more refined understanding of general relativity to fit the data to the required level of precision. The Search for Quantum Gravity However, there are some cases where not even general relativity can quite give us meaningful results. Specifically, there are cases where general relativity is incompatible with the understanding of quantum physics. One of the best known of these examples is along the boundary of a black hole, where the smooth fabric of spacetime is incompatible with the granularity of energy required by quantum physics. This was theoretically resolved by the physicist Stephen Hawking, in an explanation that predicted black holes radiate energy in the form of Hawking radiation. What is needed, however, is a comprehensive theory of gravity that can fully incorporate quantum physics. Such a theory of quantum gravity would be needed in order to resolve these questions. Physicists have many candidates for such a theory, the most popular of which is string theory, but none which yield sufficient experimental evidence (or even sufficient experimental predictions) to be verified and broadly accepted as a correct description of physical reality. Gravity-Related Mysteries In addition to the need for a quantum theory of gravity, there are two experimentally-driven mysteries related to gravity that still need to be resolved. Scientists have found that for our current understanding of gravity to apply to the universe, there must be an unseen attractive force (called dark matter) that helps hold galaxies together and an unseen repulsive force (called dark energy) that pushes distant galaxies apart at faster rates.

Examine the use of animal imagery in modern short stories and their Essay

Examine the use of animal imagery in modern short stories and their symbolic significance - Essay Example In addition, the degree to which a character is related to the animal in question may have some impact on the characteristics that are brought out in each. A nanny closely related to a busy parakeet might cause both woman and animal to take on stronger characteristics of nagging and cleanliness, for instance. A man closely related with his bulldog might also seem to be watchful, noisy and largely for show. What is interesting about this use of animal imagery in stories is the way in which this relationship develops to bring out specific characteristics in both animal and character. Two stories that provide a great deal of insight into this relationship are Franz Kafka’s Metamorphosis and Larissa Lai’s Salt Fish Girl. Although the story takes up less than 100 pages, Franz Kafka’s story Metamorphosis lends itself to a wide variety of interpretations as it uses the image of the cockroach to emphasize attributes of its main character. From its small size to a brief summary of its events, there doesn’t seem to be all that much to the story itself upon first glance. The story follows the experiences of Gregor Samsa after he wakes up one morning to find himself turned into a giant bug in his own bed. As he reveals himself to his family and his employer, it becomes obvious that this change is not meant to be a figurative change on the part of the author, but is also a physical change. Although the family continues to care for him, providing him with food and water and cleaning his room once a day, Gregor becomes more and more detached from them, eventually finding it difficult to keep track of what has been happening around him. His room becomes dirtier, his family becomes less attentive a nd he becomes less concerned with their welfare in connection with his own. As his sister and mother move his personal furniture out of his

Designs Essay Example | Topics and Well Written Essays - 1500 words

Designs - Essay Example Giles Colborne uses the design of small and commonly used gadgets to explain how simplicity can be used in the design. The example of the bicycle design seemed exciting to me. At first, I thought that any new design of a bicycle, whether simple or complex, should include the gearing system; Giles challenged me when he said that a design of a bicycle can be made simple by removing the gearing system and the front wheel. My excitement was lowered when he said that the design might be simple to the one designing bicycle but complex and difficult to the one using it (Colborne, 2010). His example of design made me learn that I should consider the user anytime I choose to use simplicity in any design. In his explanation on how to use the simplicity he employs four designs of a remote control; these four designs make use of organizing, removing, hiding or displacing strategy. Looking at the four designs, I was fascinated by designs which used organizing, removing and displacing strategies. The organizing strategy is a strategy everyone employs at least once a day; we use it every day to make what we have usable, therefore, this strategy is familiar to everyone. The strategy of organizing does not need extra costs because it uses what is already available (Colborne, 2010); therefore, it is low on costs. In addition, since the components of the gadget have only been rearranged, the user will not have difficulties adjusting to the new design; he or she will only need to master the new positions of the components which are placed in positions that are convenient to the user. The design that uses the strategy of removing is also interesting, there are some things which might not be useful to the user and just as we get rid of things we do not need from our houses, we can also get rid of the components that are no longer useful in a gadget. This design is challenging because of its counterintuitive nature (Colborne, 2010). However, it is quite effective in terms of cost as it does not require extra materials. This design works with different applications; it has been used in designing of products, websites, as well as mobile applications. This design is also user-friendly; the user is not going to have too many components on the gadget, which are not important for the use of the gadget. The design that uses displacing is intriguing; the user does not need to operate all the components using the remote control, some components can be displaced from the remote control to the television screen (Colborne, 2010). With this design, the user has a remote control that is more easy to use because most times the user will be scrolling down the menu and stop worrying of what each button on the remote control means. I realized that this design has been applied in designing the radio changer; the button for selecting whether to play music using CD, FM radio, AUX or USB is only one, and the user scrolls down the menu on the screen to find his or her choice at the m oment. This design makes the user feel as part of the system, and this helps him or her to know the operation of the system, and gives the user satisfaction while operating the gadget. Question 2 Isaacson in his book titled as â€Å"Steve Jobs† presents the biography of a computer revolutionist Steve Jobs. Steve Jobs’ life history is like a summary of good designs in the digital world; it describes the designs pioneered by Steve Jobs and their success, which led to the change of people’s lives and the way they do things. Through Apple, a company he headed, he was able to come up with designs such as Macintosh operating software, ipad, iPod, and iphone; with these designs the world was able to do things in a different way (Isaackson, 2011). Among his designs, iPad, iPod

Benefits of Multiple Intelligences

Benefits of Multiple Intelligences As there is no standard definition of intelligence, it remains one of the most controversial subjects in psychology as well as education. While some researchers suggested that intelligence is a general ability; other believe that it is a combination of various ranges of skills and talents. Based on the theories of seeing intelligence as a general ability, IQ (Intelligence Quotient) tests which evaluate abilities as problem-solving, memory, learning, and pattern recognition have been widely popular in diagnosing learners abilities and potential, especially among young learners. However, some indicated that the tests were disputable and limited, as non-cognitive factors such as emotions also play an important role in peoples lives, which the IQ tests do not include. Also, the IQ tests were unable to reflect on how people learn and acquire knowledge. A successful language learner requires a wide variety of abilities which an IQ test is unable to diagnosis. (Lightbown Spada, 2002) It wa s until the introduction of Multiple Intelligences (MI) by Howard Gardner in 1983 that emotional intelligences were formally acknowledged and intelligences were seen as a range of interconnected abilities and talents (Gardner, 1983). Gardners theories revolutionize the intellectual world, brought new insights into education as MI theories seek to help students identify and develop their strengths; discovering more effective ways of teaching as well as learning. This article gives a brief introduction on the development of intelligence theories and MI theories. Then it focuses on the benefits of MI theories and how it could be accommodated with English language teaching methods. 2 Theories of Intelligence According to the Merriam-Webster Dictionary, the word intelligence means: the ability to learn or understand or to deal with new or trying situations or the ability to apply knowledge to manipulate ones environment or to think abstractly as measured by objective criteria (Retrieved May 18th, 2010, from http://www.merriam-webster.com/dictionary/intelligence). Historically, the first people who studied intelligence were neither psychologists nor educators but philosophers such as Plato who linked peoples intelligence to blocks of wax, differing in size and purity (Cianciolo Sternberg, 2004). It was in the early twentieth century that Charles Spearman, a British psychologist proposed the theory of general intelligence (or the g factor) which brought light into modern theories of intelligence. Spearman compared a number of mental aptitude tests and found similarities in the results. Therefore, he concluded that intelligence is a general cognitive ability which could be measured and anal yzed (Spearman, 1904). Later on, the French psychologist Alfred Binet invented the first intelligence test, known as todays IQ (Intelligence Quotient) test (Cianciolo Sternberg, 2004). However, as scholars began to realize that the general intelligence theory emphasized only on cognitive aspects such as problem-solving, the need for a new intelligence emerged. In the 1920s, Edward Thorndike described the term social intelligence as the ability to manage and understand people and to act wisely in human relations (Matthews et al., 2004). Similarly, in 1940, David Wechsler argued that conative non-intelligent factors which contribute strongly to intelligent behavior are essential to success in life and that the intelligence model would not be complete unless such factors are included (Boyatzis, 2007). In 1983, Gardner introduced the theory of Multiple Intelligence which included both Interpersonal intelligence (the ability to understand the inner feelings of other people) and Intrapersonal intelligence (the ability to understand oneself) which deals with emotions (Gardner, 1983). Gardner believed that the general intelligence was unable to fully explain cognitive ability and performance outcomes, and that intelligence is too complicated to be restricted in one concept. 3 The theory of Multiple Intelligences Originally, Gardner identified seven types of intelligence in 1983, which includes: Verbal/linguistic, Logical/mathematical, Musical, Bodily/kinesthetic, Spatial/visual, Interpersonal and Intrapersonal intelligence (Gardner, 1983). The first two have been highly valued in schools; the next three are often associated with arts; and the final two are what Gardner referred to as personal intelligences, dealing with feelings and emotions. An eighth intelligence, naturalistic, was added latter (Gardner, 1999). In Frames of Mind, Gardner pointed out that the traditional intelligence which school systems normally emphasis on is mainly based on a narrow range of verbal/linguistic and logical/mathematical skills. As though such skills are important to an individuals studies and future career; other types of intelligences, especially the personal intelligences are also essential to human development and almost impossible to live without (Gardner, 1983). Good interpersonal skills are of significant value to an enjoyable social life. For many children, the strongest skills lie in the other areas than verbal and logical intelligence, which tend to be frequently neglected according to the traditional intelligence theory. MI theories provide students an opportunity to learn through their strengths, become more successful at learning all subjects and even improving the traditionally highly valued basic skills. According to Gardner, the eight intelligences are separate and independent. Each individual possess a basic set of intelligences which develop at different times to different degrees (Gardner, 1999). However, Gardner also stated that the intelligences are closely related to each other and rarely operate independently. They are used at the same time and tend to complement each other (Gardner, 1983). For example, a dancer requires musical skills to follow the rhythm, but also kinesthetic skills to move properly and interpersonal skills to attract the audience and intrapersonal skills to express her emotions. As the different intelligences are closely connected; when proficiency in one area develops, another area or even the whole constellation of intelligence may be enhanced (Gardner, 1983). Therefore, it is important to encourage students to explore and exercise all of their intelligences. Gardner also emphasized that there is not one intelligence superior than the other; all the intelligences are equally important and essential to an individuals development (Gardner, 1983). Most people tend to neglect kinesthetic intelligence and limit it to athletes. However, many highly professional occupations require people with good kinesthetic skills, such as electronics, mechanics and surgeons. A surgeon must acquire the ability to control his muscles very finely. As Gardner stated, the eight intelligences are amoral; which could be put to constructive or destructive use (Gardner, 1999). Therefore, it is important for teachers to understand MI theories and use it positively in their classes. 4 The benefits of MI theories Though there are certain criticisms concerned on Gardners theory of MI, it received positive response from many educators and has been widely applied to schooling. On first thought, the idea of teaching different intelligences sounds impossible for formal education; teaching one is hard enough already, let alone eight. Gardner responds to this by clarifying that psychology does not necessarily dictate education; it helps to understand its conditions instead (Gardner, 1999). Also, eight types of intelligence could be seen as eight ways of teaching instead of one; which could be more accessible to learners one way or another. On a general basis, MI theories have three benefits: Self-development and formation. MI theories can help students and teachers better understand their abilities. It helps students to build up confidence as it demonstrates how they can use their strengths to address their weaknesses. It motivates students to find where their interest and strength lies and push their abilities further. A broader choice of schooling. All intelligences are required for an individual to live a full life. Therefore, teachers need to attend to all intelligences, not just the ones that the traditional intelligence focuses on. MI theories are suitable for differentiated and individualize learning; providing teachers the potential to develop new and flexible programs which might better meet the learners needs. Teachers could also redesign old courses to suit new requirements (Green Tanner, 2005). A variety of activities could be included in the new curriculum, which would easily motivate and attract learners. MI theories also look into morality. Gardner once considered adding a moral intelligence to the MI theories. But he later came to the conclusion that Morality is a complex concept combined with numerous psychological aspects such as personality, will and character. Therefore it is not an intelligence in itself (Gardner, 1999). But he did not give up on the idea of moral intelligence and stated that we must figure out how intelligence and morality can work together to create a world in which a great variety of people will want to live (Gardner, 1999). Sometimes teachers unconsciously adapt MI theories into their teaching program such as using visual support or playing a song. When they fully understand MI theories and its benefits; it could be more beneficial to them in their teaching process. Therefore, it is essential to include MI theories in teacher education. 5 Accommodating MI theories in ELT MI theories have the potential to be adapted into all teaching methods, although there are three main approaches which collaborate with MI theories constructively. They are the Communicative Language Teaching Approach (CLT), Task-based Learning (TBL) and the SAFER model. The Communicative Language Teaching Approach (CLT) The definition of CLT differs among different people; a narrow interpretation of is that it is a teaching approach used in second or foreign language education which sees communication as the method and the goal of learning a language. Activities in CLT typically involves student making conversations, role-plan and simulation being popular ones (Harmer, 2007). CLT considers learners needs and different requirements just as MI do, also being flexible in nature. CLT is a typical approach which combines different intelligences together. By making conversations, students have the opportunity to practice their verbal and logical skills. When talking to each other, they also practice their interpersonal skills. By asking students to make a conversation regarding a picture or ones own experience, visual and intrapersonal skills could also be developed. Students could also be asked to sing or dance along songs to practice their musical and kinesthetic skills. Task-based Learning (TBL) TBL is a teaching approach of making meaningful tasks the focus of the learning process. It is formed on the assumption that students will naturally acquire the language focused on tasks instead of language forms (Harmer, 2007). Willis (1994) suggested that TBL usually contains three stages: Pre-task, the Task cycle and the Language focus (cited from Harmer, 2007). Like CLT, TBL also frees the students from limited language control. In all three stages students are encouraged to use their own language rather than practicing one pre-selected item. The language explored arises from the students needs which are personalized and relevant to them. They will be exposed to a wide range of phrases, collocations as well as language forms. A TBL class also gives the students plenty of opportunities to communicate, bringing a large variety of enjoyable and motivating activities which could be combined with MI theories into the classroom. The SAFER approach Unlike the previous two, the SAFER approach is less popular and used by teachers. SAFER was proposed by Berman, indicating that this model is an alternative to the traditional ELT classroom pedagogy. Berman stated that the SAFER model incorporated former models such as PPP (Present Practice Produce) and TBL; combining educational kinesiology and Suggestopaedia techniques (Berman, 1998). The steps in SAFER includes: S: Setting the scene A: Authenticity F: Focusing on main features of each intelligence type E: Error correction R: Review (Berman, 1998) Berman believed that the SAFER method could help to create better learning conditions and enhance the learning process through revision. However, his approach is considered quite specified and not widely adapted. But Berman has indeed made a great effort in applying contemporary pedagogical thought to ELT, brining new insights to the application of MI theories. 6 Conclusions Among the two main theories of intelligence: general and multiple intelligence; MI theories have been generally considered more scientific, including non-cognitive factors such as emotions. Gardners MI theories brought new insights into education, helping students to identify and develop their strengths and discovering more effective teaching methods. Gardner stated that all the eight intelligences are equally important and essential to an individuals development. As though the intelligences are separate, they seldom operate independently. Therefore, development in one area often increases the development of another (Gardner, 1983). The intelligences could work positively and negatively, consequently, it is important for teachers to understand MI theories and how to apply it to their teaching methods. MI theories have the potential to be adapted to all teaching methods; although there are three main approaches which collaborate with MI theories constructively. Which are the Communica tive Language Teaching Approach (CLT), Task-based Learning (TBL) and the SAFER model. MI theories are of wide adaptability and flexibility, to use MI theories effectively, teachers should always remain open-minded and creative, prepared to make changes in their teaching methodology.

Farming Essay -- Personal Narrative Agriculture Papers

Farming "Beep , beep, beep, " the alarm clock sounded. "Shoot another day at work" I thought. It is 5:30 and time to head off to work. I go into the shoe room and throw on my once worn set of clothes, which consist of a tee-shirt, sweatshirt, long johns, pants, and some winter boots. I also grab a coat on the way out. I opened the door and the cold wintry blast hit my pale face. "Damn it's cold", I thought to myself. I trudged through the two feet of crusty snow and hop into my 87' Ram 50 pick-up truck. "rue, rur, rur, whiinee " the engine started. "Yes" I thought, "I don't want to jump my truck this cold morning". I started down the road into what seemed like a dark oblivion with only my headlights to guide me through. I came to the first stop sign and almost slide through it. "Whew that was close!" I shouted to myself . I start up again, a little slower this time as hoping not to slide through another stop sign, I then realize my heater is starting to kick in. It's getting warm in my truck. ,it's comfortable though. I finally arrive at work and walk in. "Good afternoon" my boss states sarcastically. It's 6:00 in the morning and its still cold in the barn. I go into the silo room and start to fill up the corn cart. The room is off to the side of the barn so it is also freezing in this part of the barn. I roll the full cart onto the cement lane ,it seems really heavy in these early morning hours. I pull in front of the first cow and think "Oh yea only 59 more to go." I get done feeding corn and move on to feeding the mineral; this only takes about five minutes because I don't have to feed as much. Next I move on to feeding protein out of the cart this takes a little more time than mineral, b... ... turn the first bolt and my wrench slips. "Ouch", I scream. "Whadidchya do?" my boss asks. " Hit my damn finger", I say. " Well don't slip off the burr and that won't happen." He instructs me. " Thanx" I said. We get the girder replaced and go in for a late afternoon dinner. I sit down and think, "warmth, ahh". Feeling begins to come back into my hands and they hurt from banging them several times on things. I eat the prepared meatballs and boiled potatoes with peas and carrots with rigorous vigor. "Will you pay me today please", I ask. "Sure", my boss says. I get my check and tell my boss and his family I'll see the tomorrow. I hop into my truck and finally start to go back home. I arrive home to find that my family has gone some where so I go in take a shower and proceed to call my buddy up on the phone to see where the party is at.

Chemistry Bonding Notes and Lewis Dot Structures

CChemistry Exam #2 Study Guide (10/07/12) I. Bonding a. Ionic Bonding i. Electrons are transferred ii. Ions are held together by electrostatic force b. Covalent Bonding iii. Electrons are somehow shared iv. Electrons are attracted to nuclei (shared) II. Electronegativity c. The ability of an atom in a molecule to attract shared electrons to itself d. Measured on Pauling Scale e. Most electronegative: Fluorine. Then Oxygen. f. Depending on electronegativity of X and Y, there are 3 possibilities: v. X and Y have identical electronegativities (Non Polar) vi.X and Y have dissimilar electronegativities (Polar)- Y is slightly negative; has greater control than slightly positive X vii. X and Y have very different electronegativities (Ionic)- Y is negative; has full control g. Polar Covalent viii. Size depends on electronegative difference ix. Arrow points to where electrons are dragged to x. Dipole Moment measured in Debyes (D) 1. [Dipole Momenti = Q*r] xi. Possesses some ionic character 2. The bigger the difference†¦ a. The more polar the bond b. The bigger the dipole c. The more ionic in character III.Electron Configuration for Ions h. Atom forms an ion with electron configuration of the closest noble gas xii. True for representative S and P block xiii. Atom will lose up to three or gain up to three electrons 3. For D-block elements d. Outer S electrons lost before outer D electrons 4. For P-block elements e. Outer P lost before the outer S electrons, which are lost before outer D IV. Ionic Radii i. Size descriptions based on charge xiv. Positive ions are always smaller than the parent atom xv. Negative ions are always larger than the parent atom j.Periodic trend xvi. Ionic radii increase within a column going from top to bottom xvii. Ionic radii decrease within a row going from left to right V. Isoelectronic Ions k. Have the same number of electrons l. Radius decreases as atomic number increases VI. Compounds m. Ionic xviii. High Melting Point and Boiling Poin t (brittle solids) xix. Soluble in polar solvents like water xx. Insoluble in nonpolar solvents like Hexane xxi. Metal and Nonmetal xxii. Any compound that conducts electric current when melted n. Covalent xiii. Low Melting Point and Boiling Point (solid/liquid/gas) xxiv. Insoluble in polar solvents (exception: Sugar! ) xxv. Soluble in nonpolar solvents xxvi. Nonmetal and Nonmetal o. Crystals xxvii. All group 1 Alkali metals and Group 7 Halogens make crystals xxviii. Sublimation: solid to a gas! VII. Lattice Energy p. Measure of how strongly ions interact together (compares sizes of ions) xxix. enthalpy of formation of the ionic compound from gaseous ions and as such is invariably exothermic xxx. he energy required to completely separate one mole of a solid ionic compound into gaseous ionic constituents q. Goes to closer energy (emits energy as heat)- always more negative number r. (+) = endothermic (absorbing energy) s. (-) = exothermic (releasing energy) t. Energy is released! xxx i. =K[(Q1Q2)/(r)] xxxii. Large for small â€Å"r† (average distance between ions)- higher boiling point, more stable, difficult to separate, but still fragile xxxiii. Large â€Å"Q†- highly charged xxxiv. Lattice energy goes down in same group VIII.Bond Order u. Triple Bond (as bond energy increases, bond length decreases! ) xxxv. Highest Bond Order xxxvi. Strongest xxxvii. Shortest v. Double Bond w. Single Bond xxxviii. Weakest xxxix. Longest xl. Lowest Bond Order IX. Resonance x. More than one Lewis Dot Structure can be drawn for the same arrangement (skeleton) of atoms. Only the bonds differ! y. True structure is a ‘hybrid’ or ‘blend’ of possible resonance structures z. Not double or single bonds, but all bonds with order 1. 3333 {. Shuffling of electrons |. Formal Charge li. Look at one atom at a time (sum of Formal Charge must add up to over all charge of structure) xlii. (# of valance e- on free atom) – [(# of lone pair e-) + (# o f bonds)] X. Octet Rule Violators }. Always OBEY the octet rule: B, C, O, N, and F. ~. 5 EXCEPTIONS we should know: xliii. ________________________ . Radical- odd number of electrons . Biradical- EVEN number of electrons – has TWO UNPAIRED electrons (O2) . Groups 5-8 (3rd row and lower can have more than 8 valance) XI. VSEPR Theory . â€Å"Valance Shell Electron Pair Repulsion† Bonds and lone pairs repel (more lone pairs= squeezed) . Determines the likely shape of a molecule . Does not describe how the bonding occurs . Steps: xliv. Draw Lewis Dot Structure xlv. Count RHED (Region of High Electron Density) xlvi. Predict electronic geometry (arrangement of RHED) xlvii. Determine molecular geometry xlviii. Are bonds polar? xlix. Is the molecule polar? . If dipoles cancel out (the same), it is non polar! . Doesn’t matter about net dipole direction, it will be polar! . Pairs of diploes not arranged to cancel (different sizes)

National Parks in Georgia