Examples

Sulfur is the central atom. There are 6 + 2×7 = 20 electrons, and 4 of them are used to make 2 bonds. The two fluorines take 6 lone pairs, and the remaining four electrons go to the sulfur:

 

 

The central atom has a steric number of 4 – two atoms and two lone pairs. The electron geometry, therefore, is tetrahedral, and the molecular geometry is bent.

 

 

Steric number 4 corresponds to sp3-hybridization where the idealized bond angles are 109.5o. Because the groups on the central atom are not identical, the bond angles differ from the idealized values.

There is a debate that the sulfur is sp2-hybridized and the lone pairs are in p orbitals and angles are close to 90o (92o). This contradicts the VSEPR theory, and your final reference should be your instructor. 

 

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