Electrons occupy shells (sometimes called energy levels). Lowest energy levels are always filled first - they are closest to the nucleus.
1st shell: 2 2nd shell: 8 3rd shell: 8
Atoms want full outer shells (like the noble gases) so they are more reactive if their outer shell is not yet full, this is why atoms react.
NITROGEN: proton number of 7
so has 7 protons and 7 electrons
1st shell must have 2
5 left to go in 2nd shell
electronic configuration is 2.5
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