9-16-11-PT-v2

9-16-11-PT-v2 - 9-16-111Understanding the Periodic...

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Unformatted text preview: 9-16-111Understanding the Periodic TableLynn A. MeltonUniversity of Texas at DallasSeptember 16, 2011Exam #1Exam #1 Tuesday September 20, 7:15 8:45 pm, room assignments will be posted on eLearning.9-16-112Understanding the Periodic Table9-16-113Elements in the samecolumn have the same(similar?) chemistry,repeated with increasingatomic mass as one goesdown a column.ValenceIn broad terms, the valence of an atom is the number of electrons available for reaction.The Aufbau (building up) Principle requires that orbitals be filled in order of increasing energy.9-16-114ValenceThe Aufbau (building up) Principle requires that orbitals be filled in order of increasing energy.In terms of energy required, the last electrons placed require the least energy to remove.Valence expresses Last In, First Out (LIFO)9-16-115ValenceValence expresses Last In, First Out (LIFO)If you write electron configurations in the order in which electron were added, the rightmost electrons are the valence electrons....
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9-16-11-PT-v2 - 9-16-111Understanding the Periodic...

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