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How to determine valence electrons through electron configuration?

Answer» AKE the electron nitrogenIt's atomic number is 7. K,lNitrogen (N) - 2,5. ( Electronic configurationn )There are 5 electrons in the outermost SHELL.There can be only 2 electrons in the first shell (K) It has to loose either 3 electrons to become duplet (2) Or GAIN 3 electrons to become octet (8).Therefore the valence electron can be either 3 if it LOSE or -3 if it gains.Please do ask if you have any doubts!!


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