# Predict the hybridization and geometry of the indicated atom

1. Sep 4, 2016

### CMATT

1. The problem statement, all variables and given/known data
Predict the hybridization and geometry of the indicated atom. Answer all parts.

2. Relevant equations
CH3CH2

There is a ( - ) sign above the second C

Hybridization = ?
Geometry = ?

3. The attempt at a solution
I know I'm supposed to count the groups around the atom, but I'm stuck on that and that's the first step. By finding that out, I can determine the number of orbitals used, and then the type of hybrid orbital.

Can someone explain how to count the number of groups? The more help the better, I really do not get it.
Thanks.

2. Sep 5, 2016

### Staff: Mentor

What does the minus mean?

What if that was a plus?

3. Sep 12, 2016

### Dr Uma Sharma

Groups are the sigma bonds and lone pairs around the atom .Only sigma bonds and lone pairs are going to use hybridized orbitals ..sigma bonds are actually equal to number of atoms around that atom .
like in this example
CH3 - in this case C has three sigma bonds with three atoms and one lone pair because of a negative charge ..so it requires four hybridized orbitals ...hence sp3
in CH3+
only three sigma bonds and no lone pair ...so it is sp2