Year 9 Radioactivity Crossword

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Across
  1. 1. The process by which unstable nuclei emits radiation.
  2. 4. Subatomic particle with a negative charge.
  3. 6. Famous Ukranian nuclear power plant that went into meltdown in 1986.
  4. 7. Type of decay that is an electromagnetic wave.
  5. 8. The process of splitting an atomic nucleus into two smaller nuclei and releasing 2 - 3 neutrons. (2)
  6. 9. Atom with a charge.
  7. 11. Type of decay with a mass number of 4 and is blocked by paper.
  8. 13. Subatomic particle with a positive charge.
  9. 14. The act of removing electrons from an atom to form an ion.
  10. 16. Form of an atom with a different number of protons and neutrons but same number of electrons.
Down
  1. 2. When a decaying nucleus causes another three other nuclei to decay, which then causes another three ... (2)
  2. 3. Type of decay that is a high-powered electron from the nucleus.
  3. 5. Using ionising radiation to kill cancerous cells.
  4. 6. Unwanted radioactive particles getting onto or into an object.
  5. 10. The time taken for the radioactivity of a sample to halve.(2)
  6. 12. Exposure to radiation, often used to sterilise food or medical equipment.
  7. 15. Subatomic particle with a neutral charge.