What happens when the protons and electrons don't equal each other?
Then you have an ion.
If the number of protons is the same as the number of electrons, the particle will have no charge.
A helium atom has 2 protons and 2 electrons.
If atoms gain electrons they become negatively charged ions. These are also called anions.
Fluorine has 9p and 9e as an atom, it forms an anion with a -1 charge when it gains 1 electron.
Lithium atoms have 3p and 3e. They lose 1 electron to form a +1 cation.
Here is a video to provide a bit more help with this concept.
This video reviews how to determine the number of protons, neutrons and electrons present in neutral atoms.
Hope this helps!