In alkaline earth metals, the electrons are more firmly held to the nucleus and hence

Options

A. atoms of alkaline earth metals are bigger than alkali metals
B. ionziations energy of alkaline earths is greater than alkali metals
C. reactivity of alkaline earths is greater than alkali metals
D. alkaline earths are less abundant in nature.

Answer

B

Explanation

when the electrons are more firmly held to the nucleus, it is difficult to remove the electrons so more energy is required.