Which of the following has the largest size?

N a

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{N a}^{+}

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M g

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{M g}^{+ 2}

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Solution

The correct option is A $N a$
As we know,
Size decreases across a period and cation have smaller size that neutral atom so $N a$ will have largest size among all.

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N a^{+}, M g^{2 +}

A l^{3 +}, N a^{+}

N a^{+}, N a, M g

M g^{2 +}

N a^{+}

M g^{2 +}

A l^{3 +}

S i^{4 +}

$N a^{+} . M g^{2 +}, A l^{3 +}$ and $S i^{4 +}$ are isoelectronic. The order of their ionic size is

F^{-}, O^{2 -}, N a^{+}, M g^{2 +}

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