oct 13 full notes - Geom axial equatorial 10/13/2010 2...

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10/13/2010 1 2 electron pairs 3 electron pairs 4 electron pairs 5 electron pairs 6 electron pairs All Period 1 & 2 atoms (sub-octet and octet systems); Some Period 3 & beyond atoms (i.e., PO 4 3- ) Only Period 3 & beyond atoms (expanded-valence systems) Trigonal Bipyramidal (AX 5 ): 120 ° in plane, and two orbitals at 90 ° to plane. P Cl Cl Cl Cl Cl Example, PCl 5 : 90 ° 120 ° 5 e groups: Trigonal Bipyramidal e
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Unformatted text preview: Geom axial equatorial 10/13/2010 2 Recall that lone pairs are less localized in space than bonding pairs. To minimize electron-electron repulsion, the lone pairs need more room than bonding pairs do. Consider I 3-(AX 2 E 3 ): 5 e groups: Trigonal Bipyramidal e Geom Most likely structure because lone pairs have the most room....
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oct 13 full notes - Geom axial equatorial 10/13/2010 2...

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