Which of the following is the correct order o | vedclass

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(D) $1$. For option $A$: The atomic radius increases down a group. However,due to the lanthanide contraction,the size of $Ga$ is slightly smaller than

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$I^{+} < I < I^{-}$

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(D) $1$. For option $A$: The atomic radius increases down a group. However,due to the lanthanide contraction,the size of $Ga$ is slightly smaller than expected,but $B $2$. For option $B$: These are isoelectronic species. For isoelectronic species,the size decreases as the nuclear charge $(Z)$ increases. The order should be $O^{2-} > S^{2-} > Cl^{-}$. Thus,$Cl^{-} $3$. For option $C$: Atomic size increases down a group. The correct order is $Sc $4$. For option $D$: For the same element,the size of the ion depends on the charge. The order of size is $I^{+} < I < I^{-}$. As the number of electrons increases (negative charge),the inter-electronic repulsion increases,leading to a larger size. As the number of electrons decreases (positive charge),the effective nuclear charge per electron increases,leading to a smaller size. This is the correct order.

Which of the following is the correct order of increasing size?

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