Which species contain(s) bond angles of approximately 104.5∘104.5^\circ104.5∘?
1 H2O\quad \text{H}_2\text{O}H2O
2 NH2−\quad \text{NH}_2^-NH2−
3 NH3\quad \text{NH}_3NH3
Only 1 and 2
Only 1
Only 2 and 3
1, 2 and 3