By using hydridisation, explain the shape of `NH_3` molecule.

Explanation

The electronic configuration of N is `1s^(2) 2s^(2) 2p_(x)^(1) 2p_(y)^(1) 2p_(z)^(1)`. In this one s and three p orbitals hybridise to form `sp^3` hybridisation. The three hybridised orbitals of nitrogen overlap with three 1s orbitals of three H atoms.The remaining unhybridised orbitals of N contain a lone pair of electrons. The geometry of molecule is pyramidal having bond angle of `107^(@)`.