Lone Pairs on the Central Atom—A Summary

When there are six electron groups around the central atom, it is sp d hybridized. AB molecules and ions with no lone pairs on the central atom have octahedral electronic geometry, octahedral molecular geometry and sp d hybridization on the central atom. 

Square pyrmnidal molecular geometry Examples IF5, Brp5 

Square planar molecular geometry Examples Xep4, IF4  

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ABg, AB5U, and AB4U2 8-13 Lone Pairs on the Central Atom—A Summary... 

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