Which of the following ions is the smallest i | vedclass

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(A) The size of an ion depends on the effective nuclear charge and the number of electrons.$1$. $A$ cation $(O_2^+)$ is formed by the loss of an elect

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$O_2^+$

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(A) The size of an ion depends on the effective nuclear charge and the number of electrons.$1$. $A$ cation $(O_2^+)$ is formed by the loss of an electron,which increases the effective nuclear charge per electron,resulting in a smaller size compared to the parent molecule $(O_2)$.$2$. Anions ($O_2^-$ and $O_2^{2-}$) are formed by the gain of electrons,which increases inter-electronic repulsion and decreases the effective nuclear charge,resulting in a larger size compared to the parent molecule.$3$. Therefore,the order of size is $O_2^{2-} > O_2^- > O_2 > O_2^+$.$4$. Thus,$O_2^+$ is the smallest ion.

Ion	Radius $(pm)$
$Q^{a+}$	$53$
$X^{b+}$	$66$
$Y^{c+}$	$40$
$Z^{d+}$	$100$

Which of the following ions is the smallest in size?

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