The correct order of increasing radii are

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Solution

The correct option is A

$B e^{+ 2}$ ion is of $2^{n d}$ period whereas $M g^{+ 2}$ and $N a^{+}$ ion are $3^{r d}$ period ions. $3^{r d}$ period ions have greater size than $2^{n d}$ period ions.Among the ions of same period larger the positive charge,smaller is the ion

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The correct order of increasing radii are

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

O^{2 -}

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