These ions have the same number of electrons.

M g^{+}

and

F^{+}

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L i

and

N e

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O^{2 -}

and

O^{-}

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N

and

P^{3 -}

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C a^{2 +}

and

C l^{-}

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Solution

The correct option is E $C a^{2 +}$ and $C l^{-}$
Both $C a^{2 +}$ and $C l^{-}$ have 18 electrons.

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