9-19-11-PT - 9-19-111Understanding thePeriodic Table:...

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Unformatted text preview: 9-19-111Understanding thePeriodic Table: TrendsLynn A. MeltonUniversity of Texas at DallasSeptember 19, 2011Exam #1Exam #1 Tuesday September 20, 7:15 8:45 pm, room assignments have been be posted on eLearning in the file Exam 1 Details F11.pdf (in Course Information and Syllabus folder)9-19-112Understanding the Periodic Table9-19-113Elements in the samecolumn have the same(similar?) chemistry,repeated with increasingatomic mass as one goesdown a column.ValenceThe 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)9-19-114ValenceValence 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.9-19-115chemed.chem.purdue.eduValence9-19-116Balancing ChargesIsoelectronic SeriesAs Z increases in an isoelectronic series, the attraction of the positively charged nucleus for the negatively charged electrons increases.The electrons are pulled closer to the nucleus, hence a smaller size. 9-19-117Understanding the Periodic TableNext timeValence chemistry from configurationsCharges how does the balance between positive and negative charges work out?Trends one way to deal with too much information! our task this time9-19-118Balancing ChargesForce between two electric charges =Q1Q2/4or2 (- means attraction)This is Coulombs Law....
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9-19-11-PT - 9-19-111Understanding thePeriodic Table:...

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