If the elements ‘X’ & ‘Y’ have similar outer most electronic configuration then X&Y are belonging to _______

The elements belongs to same group which are having similar outermost electronic configuration

$\mathrm{EQ}:{\mathrm{H}}_1\to 1{\mathrm{s}}^2$

${\mathrm{Li}}_3\to 1{\mathrm{s}}^{2}2{\mathrm{s}}^2$

${\mathrm{Na}}_{11}\to 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^{6}3{\mathrm{s}}^1$

${\mathrm{k}}_{19}\to 1{\mathrm{s}}^2 2{\mathrm{s}}^2 2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}4{\mathrm{s}}^1$

Same group elements have similar electronic configuration and physical and chemical