How do you calculate steric numbers?

1 Answer
Jun 28, 2016


This is a bit old-fashioned, but steric number refers to the number of atoms bound to the central atom PLUS the number of lone pairs borne by that atom.


The oxygen atom of the water molecule thus has a steric number of 4; as does carbon in methane; as does chlorine in perchlorate, #ClO_4^-#.