Lecture #19 - 1 FOR GROUPS 1,2 and 13 to 18 TRENDS IN IONIC...

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Unformatted text preview: 1 FOR GROUPS 1,2 and 13 to 18 TRENDS IN IONIC RADII Same reasons as for atomic radii. Cations and anions... IONIC RADIUS IONIC RADIUS IONIC RADIUS Chemistry 2A-c w2009 (Ch9-19)196 Chemistry 2A-c w2009 (Ch9-19)196 2 Cations are smaller than corresponding neutral atoms. Anions are larger than their corresponding neutral atoms. Na is 186 pm and Na + is 95 pm F is 64 pm and F- is 133 pm Same nuclear charge and repulsion among e-1 s increases radius One less electron electrons pulled in by nuclear charge Chemistry 2A-c w2009 (Ch9-20)197 Chemistry 2A-c w2009 (Ch9-20)197 Example: 3 Chemistry 2A-c w2009 (Ch9-21)198 Chemistry 2A-c w2009 (Ch9-21)198 4 ELECTRON AFFINITY ELECTRON AFFINITY The energy change associated with the addition of an electron to a gaseous atom. There are few clear trends. E = -3.4 eV or -328 kJmol-1 EA = -E: the electron affinity is increased if E<0....
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This note was uploaded on 02/25/2009 for the course CHEM chem 2a taught by Professor Ng during the Winter '09 term at UC Davis.

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Lecture #19 - 1 FOR GROUPS 1,2 and 13 to 18 TRENDS IN IONIC...

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