Element - A substance with only one kind of atom, Compound - Two or more elements chemically joined, Ion - An atom that has lost or gained electrons , Isotope - An atom from an element with a different number of neutrons, Nucleus - The centre of an atom, contains protons and neutrons, Electron - A negative particle that orbits the atom, Proton - A positive particle found in the nucleus of an atom, Neutron - A neutral particle found in the nucleus of an atom, Atomic number - The number of protons in an atom, also the number of electrons, Atomic mass - The number of protons and neutrons added together,

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