Radioactivity Recap

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Across
  1. 2. A neutral subatomic particle
  2. 6. This type of radiation is also known as a helium nucleus
  3. 10. An unstable variation of an atom that must emit radiation to become stable
  4. 11. The element used by Rutherford to discover the modern structure of the atom
  5. 12. You use this in your kitchen, but it also stops beta radiation
  6. 13. Beta particles are also known as .........
Down
  1. 1. Aside from skin, this stops alpha radiation
  2. 3. Beta particles have this charge
  3. 4. The third type of radiation that is also an electromagnetic wave
  4. 5. The gain or loss of an electron
  5. 7. This gives a nucleus an overall positive charge
  6. 8. A thick layer of this stops gamma radiation
  7. 9. A variation of an atom that contains more neutrons in the nucleus