AQA Nuclear Radiation

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Across
  1. 1. part of the atom that is positively charged
  2. 4. ____ number tells us how many protons and neutrons are in the nucleus
  3. 5. a beta particle has this charge
  4. 10. radioactive particle that is a fast moving electron
  5. 11. radioactive particle that is made of two protons and two neutrons
  6. 12. ____ number tells us how many protons an atom has
  7. 13. JJ ____ discovered electrons
  8. 14. an alpha particle has this charge
Down
  1. 2. discovered the nucleus
  2. 3. type of radiation that is a wave
  3. 5. the neutral part of an atom
  4. 6. part of the atom that is small and negatively charged
  5. 7. the time taken for half of the radioactive atoms to decay
  6. 8. James _____ discovered neutrons in the nucleus
  7. 9. John ____ scientist who said everything is made out of atoms