Question

Which of the following molecules has one lone pair of electrons?

Answer 1

You can automatically rule out CH₄ since it has no lone pairs at all around the central atom. Water has 2. Ammonia is the only Lewis structure that contains one lone pair.

Answer 2

The ammonia molecule contains three single bonds and one lone pair on the central nitrogen atom . The domain geometry for a molecule with four electron pairs is tetrahedral, as was seen with CH4. In the ammonia molecule, one of the electron pairs is a lone pair rather than a bonding pair.

Hope this helps :}

-bucky