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Among the following simple ions is

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${Na}^{+}$

{SO}_{4}^{- 2}

{NO}_{3}^{-}

{PO}_{4}^{- 3}

answer is A.

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Detailed Solution

A simple ion consits of only one atom. Ex: ${Na}^{+}$

A compound ion is an ion that consists of two or more atoms of different elements to form a single unit.

Ex: ${SO}_{4}^{- 2}$

It behaves as a single unit and is composed of one atom S, and four atoms of Oxygen.

Ex: ${NO}_{3}^{-}$

With one atom of Nitrogen and three atoms of Oxygen, it behaves as single unit.

Ex: ${PO}_{4}^{- 3}$

One atom of Phosphorus and four Oxygen atom, it behaves as single unit.

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