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Need for 4 equal half bonds - excitation before covalent bonding
(Using CH4 as an example)C forms 4 single covalent bonds with 4 Hs4 unpaired e-s from one C interacting with another 4 unpaired e-s from four HsGround state of C atom only have 2 unpaired e-s To give 4 unpaired e-s, electron can be excited from 2s orbital to the vacant 2p orbital
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3 x C-H bonds originate from 2p orbitals (C) and 1s orbitals (H)
1 x C-H bond originates from 2s orbital (C) and 1s orbitals (H)
Latter seems shorter than the former but C-H bonds within CH4 are all of equal length.
Before the 2s and three 2p orbitals of C bond with four 1s orbitals of H, they are mixed to produce 4 equal hybrid orbitals.