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Answer: Ammonia and ammonium have different valencies because the total number of energies contained in the outermost orbit varies as they don’t have the same number of electrons.
Valency
The number of bonds that an atom can form as part of a compound is the valency of an element.
Valency of ammonia and ammonium ion
The formula of ammonia- NH 3
The valency of ammonia is 0 as it follows the octet rule.
5+3= 8 electrons are present in the outermost orbit.
It is a very stable compound as its oxidation number is 0. Thus, it does not lose or gain any more electrons.
Therefore, the valency of ammonium ion is +1.
