A) \[_{3}Li{{\to }_{19}}K\] Ionization enthalpy increases
B) \[_{9}F{{\to }_{35}}Br\] Electron gain enthalpy (negative sign) increases
C) \[_{6}C{{\to }_{32}}Ge\] Atomic radii increases
D) \[_{18}Ar{{\to }_{54}}Xe\] Noble character increases
Correct Answer: D
Solution :
On moving down a group atomic radii increases.
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