Which of the following is the smallest ion?

A l^{3 +}

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F^{-}

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M g^{2 +}

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N a^{+}

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Solution

The correct option is D $A l^{3 +}$
A group of ions all containing the same number of electrons is called isoelectronic species. i.e. in this case all have $10$ electron
In an isoelectronic series Ionic size decreases with an increasing nuclear charge. As nuclear charge increases in an isoelectronic series the ions become smaller.

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