By using hybridisation, explain the shape of `CH_4` molecule.

Explanation

In `CH_4` central atom C has electronic configuration as `1s^(2) 2s^(1) 2p_(x)^(1) 2p_(y)^(1) 2p_(z)^(1)`. Its exicited state electronic configuration is `1s^(2)2s^(1)2p_(x)^(1)2p_(y)^(1)2p_(z)^(1)`. In this one s and three p orbitals hybridise to form `sp^3` hybrisation .The four `sp^3` hybrid orbital of four hydrogen atoms .The geometry of molecule is tetrahedral with bond angle of `109.5^(@)`.