In an atom there is a nuclues in the middle of the atom, It contains Protons and neutrons, it has a positive charge because of protons. The electrons move around the nuclues, they're negatively charged, they're tiny but cover a lot of space, they have virtually no mass.
Proton has a mass of 1 and is +1 charge
Neurton has a mass of 1 and has no charge
Electron has a mass of very small often 0 and has a charge of -1
Number of protons usually equals number of electrons. If some electrons are added or removed, the atom becomes charged and is then an ion.
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