Correct option is A
In a given period of the periodic table,
alkali metals have the
lowest ionisation potential. This is because alkali metals have only one electron in their outermost shell, which they can easily lose to achieve a stable electron configuration. As a result, it requires less energy to remove this electron compared to other elements in the same period. On the other hand,
inert gases have the highest ionisation potential due to their stable and fully filled outer electron shells.
