Positively charged particles in the nucleus of an atom. Number of protons determines what kind of atom an atom is. The number of protons is also an atoms atomic number. Neutrons A particle in the nucleus of an atom having no charge. Used to stabilize the atom.
Neutrons also adds atomic mass.
Electrons Tiny negatively charged particles. Electrons orbit around nucleus like planets in our solar system orbit around the sun. An atom with the same number of protons but a different number of neutrons. The number of atoms that are in exactly 12 grams of Carbon-12.