HC 9N Nuclear physics quiz.

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Across
  1. 2. energy released as a particle or a wave
  2. 5. a negatively charged subatomic particle
  3. 8. made up of electrons protons and neutrons
  4. 9. a positively charged subatomic particle
  5. 11. a space with no particles
Down
  1. 1. a proton or a neutron
  2. 3. an atom with an electric charge
  3. 4. a subatomic particle with no charge
  4. 6. the act of emitting radiation spontaneously
  5. 7. smaller than an atom
  6. 10. the centre of an atom