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Ground state electronic configuration of carbon is 1s2 2s2 2px1y1z0, indicating that it should be divalent. Bur carbon is tetravalent. Excited state configuration of carbon atom is 1s2 2s1 2px1y1z1. In this case one of the bond will be different than rest of the three bonds. But all the four bonds in CH4 are equivalent. Hence the concept of hybridization.
A phenomenon of mixing of two or more atomic orbitals of approx. equal energy to form equal number of new orbitals with equal energy, identical shape & size, and symmetrically oriented in space. The new orbitals are called hybrid orbitals.
Also refer to the study material.
Moderation Team
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