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The smallest neutral part of an element that can take part in chemical reactions.
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'.
A particle that is smaller than an atom, such as a proton, neutron or electron.
A particle found in the nucleus of an atom, having a positive charge and a mass of 1.
A particle found in the nucleus of an atom, having zero charge and mass of 1.
The mass of something compared to the mass of something else, which is often given the mass of 1.
The central part of an atom or ion.
Tiny particle with a negative charge and very little mass that is found in shells around the nucleus of an atom.