Ch_8-1_Periodic_Table

Ch_8-1_Periodic_Table - (going across a row from left to...

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ELECTRON CONFIGURATIONS IONS Negative ions—like atoms: Examples
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ELECTRON CONFIGURATIONS Br: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4p 5 3d 10 Br - : 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4p 6 3d 10 Br - : [Kr]
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IONIZATION ELECTRON CONFIGURATIONS IONS Negative ions—like atoms: Examples Positive ions: Examples Electrons lost from largest principle quantum number Easiest to remove electrons farthest from nucleus
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ELECTRON CONFIGURATIONS Y: 1s 2 2s 2 2p 6 3s 2 3p 6 5s 2 4p 6 4d 1 4s 2 3d 10 Y: 1s 2 2s 2 2p 6 3s 2 3p 6 5s 2 4p 6 4d 1 4s 2 3d 10 Y 3+ : 1s 2 2s 2 2p 6 3s 2 3p 6 4p 6 4s 2 3d 10 = [Kr]
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ELECTRON CONFIGURATIONS: Ground State and Excited State 3s __ 2p __ __ __ 2s__ E Ground state1s 2 2s 2 2p 4 O 1s ↑↓ 2s ↑↓ 2p ↑↓ Excited states: 1s ↑↓ 2s ↑↓ 2p ↑↓ ↑↓ Is __ 1s 2 2s 1 2p 5 1s ↑↓ 2s 2p ↑↓ ↑↓ 1s 1 2s 2 2p 5 1s 2s ↑↓ 2p ↑↓ ↑↓ 1s 1 2s 2 2p 4 3s 1
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ATOMIC RADIUS Li nucleus (+3) 2 inner electrons Approx. 3-2 = 1 Lithium) Beryllium Be nucleus (+4) o Size increases as principle quantum number increases (going down rows) o Size decreases as effective nuclear charge increases
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Unformatted text preview: (going across a row from left to right) Approx. 4-2 = 2 ATOMIC AND IONIC RADIUS LANTHANIDE CONTRACTION Lanthanide contraction is due to a larger effective nuclear charge because of less effective screening by the 4f electrons. IONIZATION ENERGY The trend in first ionization energy in the periodic table. o Ionization energy decreases as principle QM increases (size) o Ionization energy increases as effective nuclear charge increases ELECTRON AFFINITY ELECTRON AFFINITY AND ELECTRONEGATIVITY Actual release in energy or stabilization when an atom acquires an electron. The more negative it is the more the atom wants an additional electron. Qualitative measure of how much an atom wants an additional electron. F is the most electronegative element. ELECTRONEGATIVITY ELECTRONEGATIVITY...
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This note was uploaded on 11/18/2010 for the course CHEM 230 taught by Professor Desilva during the Spring '08 term at Montclair.

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Ch_8-1_Periodic_Table - (going across a row from left to...

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