Among the iso-electronic ions $N a^{+}, M g^{2 +}$ and $A l^{3 +}, N a^{+}$ ion has the largest size.

True

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False

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Either

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Neither

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Solution

The correct option is A True
Effective electronic charge increases as the charge of the cation increases and atomic size desreases with increase in effective electronic charge.

In case of isoelectronic species size decreases with increasing positive charge.

So the given statement is true.

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