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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?
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.
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.
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