Atoms of an element with different neutron number - Isotopes, Positive charge particle in the nucleus - Proton, Neutral particle in the nucleus - Neutron, Protons plus neutrons - Mass number, Number of protons - Atomic number, Mass of an atom taking into account abundance - Relative atomic mass, The amount of an element of each mass - Abundance, Negatively charged particles - Electrons, Centre of nucleus containing protons and neutrons - Nucleus, Central value of a set of data - Average, Substance made of one type of atom - Element, Symbols showing elements in a substance - Formula,

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