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(C) In the periodic table,as we move down a group,the number of shells increases,which leads to an increase in the atomic radius.$C$ $(Z=6)$ and $Ge$

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$_{6}C 	o _{32}Ge$: Atomic radii increases

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(C) In the periodic table,as we move down a group,the number of shells increases,which leads to an increase in the atomic radius.$C$ $(Z=6)$ and $Ge$ $(Z=32)$ belong to Group $14$. Moving from $C$ to $Ge$ represents moving down the group,hence the atomic radius increases.For option $A$,ionization enthalpy decreases down the group.For option $B$,electron gain enthalpy (magnitude) generally decreases down the group.For option $D$,noble character is a property of the group and does not increase significantly in the manner described.

Which of the following series correctly represents the relationship between the elements from $X$ to $Y$ $(X \to Y)$?

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