# If Z=5, how many electrons are in the neutral atom?

$\text{Do you mean the atomic number Z is 5?}$
And thus we would have the element boron. If $Z = 5$ there are 5 nuclear protons, i.e. 5 massive, positively-charged nuclear particles... And thus, for electrical neutrality, there must be 5 electrons, 5 fundamental particles of negligible mass but unit negative charge, conceived to whizz about the nuclear core.....