If X and Y are the second ionisation potentia | vedclass

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(A) The general electronic configuration of an alkali metal is $ns^1$. After the removal of the first electron (first ionization energy),it attains a

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$X > Y$

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(A) The general electronic configuration of an alkali metal is $ns^1$. After the removal of the first electron (first ionization energy),it attains a stable noble gas configuration (octet). Therefore,the removal of the second electron requires a very high amount of energy (second ionization energy).In contrast,the general electronic configuration of an alkaline earth metal is $ns^2$. After the removal of the first electron,it attains an $ns^1$ configuration. The removal of the second electron is relatively easier compared to the alkali metal because it does not involve breaking a stable noble gas core.Thus,the second ionization energy of an alkali metal $(X)$ is significantly higher than that of an alkaline earth metal $(Y)$ of the same period.Therefore,the correct relation is $X > Y$.

If $X$ and $Y$ are the second ionisation potentials of alkali and alkaline earth metals of the same period,then:

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