# Does ammonia have filled pi orbitals or not?

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Oct 18, 2017

Well, look up the MO diagram of ${\text{NH}}_{3}$. I get:

So yes, it has filled $\pi$ orbitals. Any $\pi$ orbital is doubly-degenerate, meaning that there are two identical energies. The HOMO-1 here are your two $\pi$ bonding molecular orbitals.

Note that they aren't really making $\pi$ bonds.

The HOMO-2 and HOMO-1 orbitals are what were involved in making the three $s {p}^{3}$ bonds with the surrounding $\text{H}$ atoms. The HOMO holds the nonbonding (slightly bonding) pair of electrons.

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