# Why is the ammonia molecule sp^3-"hybridized" even though there are only 3xxN-H bonds?

Nitrogen has 5 valence electrons, and it forms $3 \times \sigma - \text{bonds}$ with the hydrogen atoms, which each contribute $\text{1 electron}$.
$\angle H - N - H \cong 104 - {5}^{\circ}$