The first ionisation energies of alkaline ear | vedclass

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Question

(A) The first ionisation energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom. As we move from alkali

Vedclass · Accepted Answer

There is increase in the nuclear charge of the alkaline earth metals

Vedclass · Answer

(A) The first ionisation energy is the energy required to remove the most loosely bound electron from an isolated gaseous atom. As we move from alkali metals (Group $1$) to alkaline earth metals (Group $2$) in the same period,the nuclear charge increases. An increase in nuclear charge leads to a stronger electrostatic attraction between the nucleus and the valence electrons. Consequently,more energy is required to remove an electron from alkaline earth metals compared to alkali metals. Therefore,the first ionisation energies of alkaline earth metals are higher due to the increase in nuclear charge.

The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because

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