Which of the following compounds does not contain a polyatomic ion? How do you determine this?

Question

calcium carbonate
calcium sulfate
calcium phosphate
calcium sulfide?

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Answer 1 · 2018-06-03T20:37:28

Calcium Sulfide: $CaS$ $"CaS"$

A polyatomic ion is an ion with multiple atoms.

Polyatomic ions examples:

sulfate: ${SO}_{4}^{2 -}$ $"SO"_4^(2-)$

phosphite: ${PO}_{3}^{3 -}$ $"PO"_3^(3-)$

ammonium: ${NH}_{4}^{+}$ $"NH"_4^+$

Monoatomic ions examples:

chloride: ${Cl}^{-}$ $"Cl"^-$

iron(III): ${Fe}^{3 +}$ $"Fe"^(3+)$

oxide: $O^{2 -}$ $"O"^(2-)$

Most monoatomic anions end with -ide, such as oxide and fluoride. Calcium $(Ca)$ $("Ca")$ sulfide $(S)$ $("S")$ would follow that rule.