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The element expected to form largest ion to achieve the nearest noble gas configuration is:
A
Na
B
O
C
F
D
N
Explanation
Among isoelectronic ions, size decreases as atomic number increases, so $N^{3-}$ is largest.
Detailed Solution
Among isoelectronic monoatomic species, size is inversely proportional to atomic number.
Hence among isoelectronic species $Na^+$, $O^{2-}$, $N^{3-}$, $F^-$ (having nearest noble gas configuration);
Order of size is $Na^+<F^-<O^{2-}<N^{3-}$
$N^{3-}$ has least atomic number, hence largest size.