MS115a Lect 04b 10 03 2011

MS115a Lect 04b 10 03 2011 - Types of Primary Chemical...

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Metallic Electropositive: give up electrons Ionic Electronegative/Electropositive Colavent Electronegative: want electrons Shared electrons along bond direction Types of Primary Chemical Bonds Isotropic, filled outer shells + - + - + - + - + + + + + + + + + + e- e- e- Close-packed structures
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+ + Isotropic bonding; alternate anions and cations + Just barely stable Radius Ratio “Rules”
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Cubic Coordination: CN = 8 2R A 2(r c + R A ) 2 A R a = ( 29 3 c A A r R R + = 3 1 0.732 c A r R = - = a 2( ) 3 A c R r a + =
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Radius Ratio Rules CN (cation) Geometry min r c /R A 2 none (linear) 3 0.155 (trigonal planar) 4 0.225 (tetrahedral)
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CN Geometry min r c /R A 6 0.414 (octahedral) 8 0.732 (cubic) 12 1 (cuboctahedral)
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Isotropic bonding Maximize # of bonds, subject to constraints Like atoms should not touch ‘Radius Ratio Rules’ – rather, guidelines
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This note was uploaded on 01/03/2012 for the course MS 115a taught by Professor List during the Fall '09 term at Caltech.

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MS115a Lect 04b 10 03 2011 - Types of Primary Chemical...

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