lecture19a revised(11-15-2006) Ch 9

lecture19a revised(11-15-2006) Ch 9 - Chemistry 2A-c...

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1 Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch9 (Ch9 -21)198 21)198
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2 ISOELECTRONIC SPECIES? EXAMPLES Which is bigger? Na or Rb Rb higher n, bigger orbitals K or Ca Ca has a higher Z eff than K Ca or Ca 2+ Ca bigger than cation Br or Br - Br smaller than anion What about QUESTION…. Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch9 (Ch9 -22)198 22)198
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3 The species F - , Na + ,Mg 2+ have relative sizes in the order 1F - < Na + <Mg 2+ 2F - > Na + >Mg 2+ 3N a + >Mg 2+ > F - 4N a + =Mg 2+ = F - 5M g 2+ > Na + >F - Check numbers Na + is 95 pm Mg 2+ is 66 pm F - is 133 pm ALL 1s 2 2s 2 2p 6 ALL are isoelectronic Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch9 (Ch9 -23)198 23)198
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4 ELECTRON AFFINITY ELECTRON AFFINITY The energy change associated with the addition of an electron to a gaseous atom. X(g) + e X (g) There are few clear trends……. F(g) + e F (g) Δ E = -3.4 eV or -328 kJmol -1 EA = - E: the electron affinity is positive if E<0. Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch9 (Ch9 -25)202 25)202
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5 TRENDS IN EA ELECTRON AFFINITY ( Δ E MORE NEGATIVE ) ELECTRON AFFINITY MORE NEGATIVE Chemistry 2A
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This note was uploaded on 04/23/2008 for the course CHEM 2A taught by Professor Guo during the Fall '08 term at UC Davis.

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lecture19a revised(11-15-2006) Ch 9 - Chemistry 2A-c...

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