How many lone pairs of electrons exist on the central atom in ammonia (NH3)?

1. two

2. four

3. three

4. none

5. one

2 Answers

  • 5. one

    The central atom in ammonia is nitrogen which will be connected to three hydrogen atoms. Nitrogen has 5 valence electrons, so if it shares electrons with three hydrogen atoms, it will have one lone pair of electrons.

  • I think just one because ammonia looks approximately like this:

    H

    |

    :N – H

    |

    H

    N has 5 valence electrons and tries to pull in another three from the hydrogen atoms, leaving the remaining two as an electron pair. So the overall shape is pyramidal

    Source(s): Year 12 chem

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