(C) The chemical reactivity of alkaline earth metals $(Group \ 2)$ increases as we move down the group. This is because the ionization enthalpy decrea

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(C) The chemical reactivity of alkaline earth metals $(Group \ 2)$ increases as we move down the group. This is because the ionization enthalpy decreases down the group,making it easier for the atom to lose electrons. The order of reactivity is $Be Therefore,$Ba$ (Barium) is the most reactive among the given options.