Steric Number

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Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
Betascript Publishing, Jul 29, 2010 - Mathematics - 72 pages
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Calculating the steric number of a molecule's central atom is a vital step in figuring out its geometry. On the molecule SF4, for example, the central sulfur atom has four ligands about it, calculated by considering sulfur's coordination number. In addition to the four ligands, sulfur also has one remaining lone pair (expanded octet does not apply in this compound). Thus, the steric number is 5. Comparing a central atom's steric number to the number of ligands (not counting lone pairs) allows one to figure out the geometry of that central atom.

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