What is the hybridization of the central atom in ${\text{NH}}_3$?

Solution

1. The central nitrogen atom has 5 valence electrons.
2. It forms 3 sigma bonds with hydrogen atoms.
3. There is 1 lone pair remaining on the nitrogen atom.
4. The total steric number is 3 + 1 = 4, which corresponds to ${\text{sp}}^3$ hybridization.
5. Hence the answer is (C).