All elements are made of atoms. Atoms are made up of 3 types of particale- protons, neutrons and electrons.
Electrons- Electrons have -1 charge. They whizz around the nucleus in orbitals. The orbitals take up most of the volume of the atom.
Nucleus- Most of the mass of the atom is concentrated in the nucleus. The diameter of the nucleus is rather titchy compared to the whole atom. The nucleus is where you find the protons and neutrons.
The mass and charge of these subatomic particles is really small, so relative mass and relative charge are used instead.
Proton, 1 (relative mass), +1(relative charge)
Neutron, 1 (relative mass), 0 (relative charge)
Electron, 1/2000 (relative mass). -1 (relative charge)
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