Series14The18ElectronRule

Series14The18ElectronRule - The 18 Electron Rule...

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The 18 Electron Rule References: Gray: chapter 5 OGC: chapter 8 XIV-1
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H L i N a K R b C s F r B e M g C a S r B a R a S c Y L a A c T i Z r H f V N b T a C r M o W M n T c R e F e R u O s C o R h I r N i P d P t C u A g A u Z n C d H g B A l G a I n T l C S i G e S n P b N P A s S b B i O S S e T e P o F C l B r I A t H e N e A r K r X e R n C e P r N d P m S m E u G d T b D y H o E r T m Y b L u T h P a U N p P u A m C m B k C f E s F m M d N o L r Element Groups Alkali metals Transition metals Alkali earths Halogens Inert or Noble gases Lanthanides Actinides XIV-2
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Geoffrey Wilkinson E. O. Fischer Nobel Prize, chemistry, 1973 “For their pioneering work, performed independently, on the chemistry of the organometallic, so called sandwich compounds” The Chemists XIV-3
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18 e - Rule for Transition Elements • Remember the dot structure for CO? C O C O Consider Cr, a transition element: Chromium: [Ar] (4s) 2 (3d) 4 6 valence e - • Like most transition elements, Cr needs 18 e - in its shell. C O C O C O 12 e - from CO ʼ s + 6 e - from Cr = 18 total e - ; formula is Cr(CO) 6 Dot structures can predict molecules; if we are given an exception, we can explain its existence, and Fgure out some of its +1 XIV-4
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This note was uploaded on 10/27/2010 for the course CH 1a taught by Professor Lewis during the Fall '08 term at Caltech.

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Series14The18ElectronRule - The 18 Electron Rule...

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