Radiactivity

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  1. Units of radioactivity
  2. The smallest particle of an element that retains its chemical properties
  3. he time taken for half the radioactive nuclei in a sample to decay
  4. The type of radiation made up of electrons
  5. The central part of an atom that contains protons and neutrons
  6. The type of radiation that is a high-energy electromagnetic wave
  7. The process by which unstable atomic nuclei emit particles or EM radiation
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