what are some of the properties of radioactive elements? at least four
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Radioactivity is the spontaneous emission of alpha, beta or gamma rays from the atom of an element whose atomic number number is greater than 82.
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Radioactive elements are unstable isotopes that release subatomic particles or energy as they decay. Alpha decay releases two protons and two neutrons. It's potentially dangerous but can be stopped by a thin barrier. Beta decay releases an electron, and a neutron becomes a proton.
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