VSEPRShapes - n MOLECULES BY V.S.E.P.R THEORY Electron...

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1 A single, double, or triple bond constitutes one domain of electron density. Therefore, to establish the number of electron domains about a central atom, count the number of atom-pair linkages and add to this any non-bonding pairs. The need to count domains, rather than simply electron pairs, has prompted the co-author of V.S.E.P.R. theory to rename it the Electron Domain theory. [R. J. Gillespie. J. Chem. Educ. 1992, 69 , 116.] 2 Listed polarity is for binary compounds (MX n ) only. Composition of ternary (MX n Y m ) and higher compounds may result in polarity for a shape that might be nonpolar if the compound were binary. SHAPES OF MX
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Unformatted text preview: n MOLECULES BY V.S.E.P.R. THEORY Electron Arrangement Bond Lone Domains of Domains Domains 1 Pairs Molecular Shape Polar? 2 2 linear 2 linear [MX 2 ] No 3 trigonal planar 3 trigonal planar [MX 3 ] No 2 1 bent (<120 o ) [MX 2 ] Yes 4 tetrahedral 4 tetrahedral [MX 4 ] No 3 1 trigonal pyramidal [MX 3 ] Yes 2 2 bent (<109.5 o ) [MX 2 ] Yes 5 trigonal bipyramidal 5 trigonal bipyramidal [MX 5 ] No 4 1 irregular tetrahedron [MX 4 ] Yes 3 2 T-shaped [MX 3 ] Yes 2 3 linear [MX 2 ] No 6 octahedral 6 octahedral [MX 6 ] No 5 1 square pyramid [MX 5 ] Yes 4 2 square planar [MX 4 ] No...
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