The 18 Electron Rule

The 18 Electron Rule - The 18 Electron Rule References Gray chapter 5 OGN chapter 18 H Li Na K Rb Cs Fr Be Mg Ca S r Ba Ra Sc Y La Ac Ti Z r Hf V

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Unformatted text preview: The 18 Electron Rule References: Gray: chapter 5 OGN: chapter 18 H Li Na K Rb Cs Fr Be Mg Ca S r Ba Ra Sc Y La Ac Ti Z r Hf V Nb Ta Cr Mo W Mn Tc Re Fe Ru Os Co Rh Ir N i Pd Pt Cu Ag A u Zn Cd Hg B A l Ga In Tl C Si Ge Sn Pb N P As Sb Bi O S Se Te Po F C l Br I At He Ne A r Kr Xe Rn Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm B k Cf Es Fm Md No Lr Element Groups Alkali metals Transition metals Alkali earths Halogens Inert or Noble gases Lanthanides Actinides 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 Cr 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 C O 12 e- from CO’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 figure out some of its chemical properties. C O O C C O-1 +1 Using the 18 e- rule • Given that H 2 Fe(CO) x exists, what does x equal? Iron: [Ar] (4s) 2 (3d) 6 → 8 valence e- Hydrogen: (1s) 1 → 1 valence e- • Fe wants to have 18 e- , because it’s a transition element, but it only has 8. it only has 8....
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This note was uploaded on 08/31/2008 for the course CH 1a taught by Professor Lewis during the Fall '08 term at Caltech.

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The 18 Electron Rule - The 18 Electron Rule References Gray chapter 5 OGN chapter 18 H Li Na K Rb Cs Fr Be Mg Ca S r Ba Ra Sc Y La Ac Ti Z r Hf V

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