Entries of Column – I are to be matched with entries of column – II. Each entry of Column – I may be matching with one or more than one entries of Column - II 

	Column – I		Column - II
I)	$1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^1$	P)	Largest ${\left(IE\right)}_1$
II)	$1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^5$	Q)	Largest ${\left(IE\right)}_4$
III)	$1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}4{\mathrm{s}}^1$	R)	Largest ${\left(IE\right)}_3$
IV)	$1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^6$	S)	Lowest  ${\left(IE\right)}_1$