Draw the structure diagram of ammonia molecule as per the valence-shell electron pair repulsion theory.

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Solution

Ammonia is made up of 1 atom of nitrogen and 3 atoms of hydrogen. Nitrogen has 8 electrons around it i.e it has 4 electron pairs. These pairs are arranged tetrahedrally. Of the 4 pairs: 1 pair is lone pair. So the resulting shape is trigonal pyramid.

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