CH 301 - Chapter 12 part 3 Lecture Notes

CH 301 - Chapter 12 part 3 Lecture Notes - PERIODIC...

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PERIODIC PROPERTIES Atomic Radii Ionization Energy Electron Affinity Ionic Radii Electronegativity
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Trends in Periodic Properties I. Columns (Groups) – Principal number increases Æ orbitals located further from nucleus “average distance from nucleus” II. Rows (periods) – Positive nuclear charge increases Æ greater attractive force on valence electrons “effective nuclear charge”
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Columns (groups) Li Na K 2s 1 3s 1 4s 1
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Row (periods) 5+ 6+ 7+ B C N 2p 1 2p 2 2p 3
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Atomic Radius
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Atomic Radii Atomic Radii in A o
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Columns (groups) Li Na K 2s 1 3s 1 4s 1 1.52 A 1.86 A 2.27 A
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Atomic Radii Atomic Radii
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Row (periods) 5+ 6+ 7+ B C N 2p 1 2p 2 2p 3 0.85 A 0.77 A 0.75 A
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Atomic radii in picometers of main group elements
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Periodicity in atomic radii
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Ionization Energy First ionization energy The minimum amount of energy required to remove the most loosely bound electron from an isolated gaseous atom to form a 1+ ion. atom (g) + energy ion + (g) + e -
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Ionization Energy Mg (g) + 738kJ/mol Mg + + e - Mg 1s 2 2s 2 2p 6 3s 2 Æ 1s 2 2s 2 2p 6 3s 1 Mg +
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22 3 7 2 7 N 1s 2s 2p ↑↑↑ ↑↓ ↑ ↓ ↑ This is N +
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Ionization Energies in kJ/mol
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Periodicity of Ionization Energies
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Columns (groups) Li Na K 2s 1 3s 1 4s 1 520 496 419 kJ/mol
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Row (periods) 5+ 6+ 7+ B C N 2p 1 2p 2 2p 3 801 1086 1402 kJ/mol
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This note was uploaded on 09/17/2011 for the course CH 301 taught by Professor Staff during the Fall '07 term at Oklahoma State.