Why ammonia is trigonal pyramidal and not trigonal planar?

Ammonia is trigonal pyramidal and not trigonal planar .
Reason:
This is because ammmonia has a lone pair of electron . In the structure of ammonia three hydrogen bonds are shown below and lone pair is shown above the nitrogen atom. As we know that , lone pair occupies more space than the bond pair so
The uper lone pair repels bond pair and due to this repulsion bond pair bends .
That’s the reason why ammonia has trigonal pyramidal shape.

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