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When finding the hybrid orbitals of C2H4, why would you identify the orbitals as one C2sp^2-C2sp^2 and two H1s-C2sp^2 orbitals? I understand how to find what the hybrid orbitals are, but I am not sure how what the 1 and 2s that follow the C and H represent.
The 1 and 2 after the H and C represent the 1 in 1s or 2 in 2sp shell respectively. This is to distinguish between other shells such as 2s, 3s, 4s, etc. or a 3sp hybrid orbital. The hydrogen has 1s because a H atom has a valence electron in the 1s shell. The C has 2sp because the orbitals are a hybrid of the 2s and 2p orbitals of the atom.
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