• # question_answer The bond angles in $NH_{4}^{+}$  and $C{{H}_{4}}$ are same but $N{{H}_{3}}$ has different bond angle. Why?

In$NH_{4}^{+}$ ion as well as in $C{{H}_{4}}$, the central atom has four shared pair of electrons. Therefore, both of them have almost the same bond angle (109°28'). But in$N{{H}_{3}}$  molecule, due to the presence of three shared pairs and one lone pair, the geometry gets slightly distorted. As a result, the bond angle is $107{}^\circ .$