## Composition of a bond (Sigma and Pi Bonds)

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

Megan Potter 1G
Posts: 35
Joined: Fri Apr 06, 2018 11:04 am

### Composition of a bond (Sigma and Pi Bonds)

When we label sigma and pi bonds, like for CH4, I know looking at one of those C-H would be σ(C2sp^3, H1S). I was just wondering what the 2 for C and 1 for H referred to? is it just the row number?

danielruiz1G
Posts: 62
Joined: Fri Apr 06, 2018 11:04 am

### Re: Composition of a bond (Sigma and Pi Bonds)

I believe this is the period that this atom belongs to on the periodic table.

Abbey Brandt 1K
Posts: 33
Joined: Fri Sep 28, 2018 12:29 am

### Re: Composition of a bond (Sigma and Pi Bonds)

I see that this question was posted a little while ago, but an answer may be helpful to current 14A students. At the first energy level, the only orbital available to electrons is the 1s orbital, but at the second level, as well as a 2s orbital, so this is what the 2 means in the question.

Carlos De La Torre 2L
Posts: 60
Joined: Tue Oct 09, 2018 12:16 am

### Re: Composition of a bond (Sigma and Pi Bonds)

the 1 and 2 simply refer to the energy level of the orbital that is participating in the bond, so it is also the period number of the atom as that is the energy level of valence orbitals.