Particle in an atome with a positive charge - Proton, Particle in an atom with no charge - Neutron, Particle in an atom with a negative charge - Electron, Smallest particle of a chemical element - Atoms, The centre of an atom - Nucleus, Mass of an atom relative to 1/12th mass carbon-12 - Relative mass, If an atomic particle is positive, negative or neutral - Relative charge, Number of protons in an atom - Atomic number, Number of protons and neutrons in an atom - Mass number, Substance made of only one type of atom - Elements, Abbreviation used for an element - Symbol, If a particle is positive, negative or neutral - Charge,

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