Chemistry - s Block Elements Question with Solution | TestHub

As alkali metals have the lowest$\mathrm{I}{\mathrm{E}}_1$values in their respectively periods and also there is a large jump between$\mathrm{I}{\mathrm{E}}_1$and$\mathrm{I}{\mathrm{E}}_2$due to the removal of second electron from the noble gas core, therefore, out of the given$\mathrm{I}{\mathrm{E}}_1$and$\mathrm{I}{\mathrm{E}}_2$values (II) belongs to alkali metals.