If you build an atom using two protons, two neutrons, and two electrons, two electrons what have you built an atom of?
Well, you have made a helium atom.......
The number of protons is crucial in detemining the identity of the atom (or element). If the atom contains 2 protons, 2 positively charged nuclear particles, then
The number of electrons determine if the element is neutral or charged. And since the number of electrons equals the number of proton, this element is uncharged.
Finally, the nucleus may contain various numbers of neutrons, massive
Here you have a NEUTRAL isotope of helium, which we would represent as