Chapter 12 Part 3 - PERIODIC PROPERTIES Atomic Radii...

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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 orbitals located further from nucleus “average distance from nucleus” II. Rows (periods) Positive nuclear charge increases 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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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
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Chapter 12 Part 3 - PERIODIC PROPERTIES Atomic Radii...

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