Question

An atom has $25$ protons, $30$ neutrons, and $25$ electrons. What is the charge of the atom's nucleus?

Answer 1

If we are considering the charge of the nucleus, then there are only the protons that can contribute to the charge as they have a charge of $+1$.

Thus the charge of the atom's nucleus is +25 with 25 protons in it.

But if asked the overall charge of the atom, then it would be 0.

As the $-25$ charge from the electrons will cancel out the $+25$ charge of protons.