Everything is made up of atoms. Atoms are the building blocks of matter, like bricks are the building blocks of a house. But atoms aren't the smallest things in the world. Atoms themselves are made up of smaller bits. There's a central bit called the nucleus and around that are lots of 'electrons'.
Electrons are very important.
They make lots of things happen. Without electrons things wouldn't dissolve, have a colour, conduct electricity, etc. Static electricity is also to do with electrons. So the electrons balance out the protons. This means the atom has no 'charge' - it's balanced.