Nucleon - A proton or neutron is a...., Quark - Constituent of a hadron, Polonium - Put into Alexander Litvinenko's tea, positron - Electron anti particle, Rutherford - Gold leaf guy, Isotope - Same protons, different neutrons, Neutrino - Lepton with no mass and no charge, Gamma ray - Massless radioactive decay, Decay constant - The probability that an individual nucleus will decay per unit time, Becquerel - Unit of activity,

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