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Atoms
The smallest neutral part of an element that can take part in chemical reactions.
Electron shells
Areas around a nucleus that can be occupied by electrons and are usually dawn as circles. Also called an electron energy level or an 'orbit'.
Subatomic particle
A particle that is smaller than an atom, such as a proton, neutron or electron.
Proton
A particle found in the nucleus of an atom, having a positive charge and a mass of 1.
Neutron
A particle found in the nucleus of an atom, having zero charge and mass of 1.
Relative mass
The mass of something compared to the mass of something else, which is often given the mass of 1.
Nucleus
The central part of an atom or ion.
Electron
Tiny particle with a negative charge and very little mass that is found in shells around the nucleus of an atom.
