5 valence electrons are provided by nitrogen to make the lewis structure of NH₃
The nitrogen atom provide 5 electrons and each of the three hydrogen atoms has 1 electron. So the total number of electrons for ammonia will therefore be 8.
In the Lewis structure of ammonia, Nitrogen is present in center and the three hydrogen atoms are present and bonded at sides of nitrogen as indicated in image Nitrogen also has a lone pair above it that is the reason why ammonia act as a Lewis base. Ammonia has tetrahedral geometry due to four pairs of electrons .
The lone pair makes space for itself by pushing the three hydrogen atoms together a little and the H-N-H bond angles are slightly less (106.6°) than the ideal tetrahedral angle of 109.5°.
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