you can see the difference b/w IE5 and IE6 is very high.. it means the element is going to inert gas configuration after removing five e-s hence the element is nitrogen N and its configuration is 1S2 2S2 2P3 Solution you can see the difference b/w IE5 and IE6 is very high.. it means the element is going to inert gas configuration after removing five e-s hence the element is nitrogen N and its configuration is 1S2 2S2 2P3.