Atomic Structure

Atomic Structure

1. Radioactivity

   • Isotopes of some elements are radioactive. This is because they have an unstable nucleus.
   • A half life is the time taken for the radioactivity of a specified isotope to fall to half its original value.
   • Natural sources of background radiation: Cosmic rays, Rocks and soil, Living things
   • The amount of radioactive decays happening per second is called the "activity" of a sample and is measured in Becquerels (Bq)

2. Alpha, Beta & Gamma

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