Half Life & Radioactivity

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Across
  1. 1. A type of radiation that is high-energy electromagnetic waves.
  2. 3. Atoms of the same element with the same number of protons but different numbers of neutrons.
  3. 4. A type of radiation made of a fast-moving electron from the nucleus.
  4. 5. The time taken for half of the radioactive atoms in a sample to decay.
  5. 6. When an unstable nucleus breaks down and gives out radiation.
  6. 7. A type of radiation made of 2 protons and 2 neutrons
Down
  1. 2. How many atoms decay each second (measured in becquerels, Bq)
  2. 4. The unit of activity.