P5 Recap Crossword

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Across
  1. 2. A disease that can arise from exposure to ionising radiation.
  2. 5. The maximum number of electrons that can fit into the second or third shell of an atom or isotope.
  3. 7. A neutral particle, found in the nucleus of atoms or isotopes.
  4. 8. The name given to the shape of a half-life curve, where the radioactivity decreases but never reaches zero.
  5. 10. A negatively charged particle, found on the outer shell of any atom or isotope.
  6. 13. The most ionising type of radiation; stopped by skin or paper.
Down
  1. 1. The time taken for half of any source of radiation to decrease by half.
  2. 3. A positively charged particle, found in the nucleus of atoms or isotopes.
  3. 4. When radioactive elements break down over time, they are said to _ _ _ _ _.
  4. 6. A version of an atom that has the same number of protons, but different number of neutrons.
  5. 9. The second most ionising type of radiation; stopped by aluminium foil.
  6. 11. The maximum number of electrons that can fit in the first shell of an atom or isotope.
  7. 12. The least ionising type of radiation; stopped by thick lead metal.