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The size of ionic species is correctly given in order

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Cr⁺ > Si⁺⁴ > Mg⁺² > Na⁺

Na⁺ > Mg⁺² > Si⁺⁴ > Cr⁺

Na⁺ > Mg⁺² > Cr⁺ > Si⁴⁺

Cr⁺ > Na⁺ > Mg⁺² > Si⁴⁺

answer is D.

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Detailed Solution

Na⁺ , Mg⁺² , Si⁴⁺ are isoelectronic(10electrons) ions, So size increases with nuclear charge(+ve charge).

Cr⁺(23): [Ar]4s⁰3d⁵, it has higher atomic number when compared with remaining.

Hence the correct order is, Cr⁺ > Na⁺ > Mg⁺² > Si⁴⁺.

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