Element - A substance which contains one type of atom, Atomic number - The number of protons in the nucleus of an atom, Mass number - Total number of protons and neutrons in the nucleus of an atom, Isotope - Atoms of the same element with the same number of protons but different numbers of neutrons, Electron - Subatomic particle with a negative charge, Proton - Subatomic particle with a positive charge, Neutron - Subatomic particle with no charge, Relative atomic mass - Average mass of an atom of an element compared to standard mass,

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