How the formation of ammonia molecule is single covlent bond?

1.	How the formation of ammonia molecule is single covlent bond?
Answer» Formation of ammonia molecule: Nitrogen (N) atom has 5 electrons (2, 5) in the outermost shell. It shares one electron each of three hydrogen atoms to form ammonia molecule as shown:One unshared pair of electrons in ammonia molecule is not involved in bond formation and is called a lone pair of electrons.

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