Question

which one of the following is a monovalent cation. A) Magnesium b) calcium c) aluminium d) ammonium
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Answer 1

Answer:

Ammonium (NH3)

The formula of ammonia NH3 and it is a compound. Its valency is 0 as it follows the Octet rule that is 5 + 3 = 8 electrons in the outermost orbit.Its oxidation number is equal to zero, which means it is a very stable compound, it does not lose or gain any more electrons.