smallest unit of an element - atom, A different form of an element with a different number of neutrons - isotope, positive particle found in the nucleus of an atom - proton, neutral particle found in the nucleus of an atom - neutron, negative particle found outside the nucleus - electron, Positive centre of an atom containing the mass of the atom - nucleus, Radiation that can damage cells - ioninsing radiation, Isotopes that emit radiation - Radioisotopes,

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