Question

what is the total charge of a nucleus of a nitrogen atom?

Answer 1

  The charge of every atom is neutral. This is because the positively charged protons are cancelled out by the negatively charged electrons.

Answer 2

Every atom has the same number of electrons as there are protons, thus making every atom neutrally charged. Therefore, there is no charge in a nitrogen atom, or any atom to begin with. The only possibly charged things are ions.