Radioactivity-all the little bits

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Across
  1. 5. What is the ionising power of gamma radiation?
  2. 8. Number of decays recorded each second by a Geiger-Muller tube
  3. 10. The smallest part of an element that can exist.
  4. 11. it cannot be predicted when a given atom will decay, this means that radioactive decay is ….?
  5. 12. When an object is exposed to radiation
  6. 14. Which subatomic particle did James Chadwick discover?
  7. 18. This occurs when an unstable nucleus changes to become more stable and gives out radiation
  8. 19. If ionisation happens in to cells it may result in __________
  9. 22. This subatomic particle has a mass of 0 and a charge of -1
  10. 23. This number is total number of protons and neutrons in an atom
  11. 24. which type of radiation has the longest
  12. 25. The time taken for number of radioactive nuclei in a sample to halve.
  13. 27. this scientist proposed the plum pudding model
Down
  1. 1. What are the units of activity?
  2. 2. The unwanted presence of materials containing radioactive atoms
  3. 3. Contains only one type of atom
  4. 4. this type of radioactive decay is an electron formed when a neutron decays.
  5. 6. The ………. number is the number of protons in an atom
  6. 7. This type of radioactive decay is a particle of two protons and two neutrons
  7. 9. This subatomic particle has a mass of 1 and a charge of 1
  8. 13. Rate at which decay occurs
  9. 15. An atom of the same element with different numbers of neutrons
  10. 16. This subatomic particle has a mass of 1 and a charge of 0
  11. 17. Will absorb (stop) alpha radiation?
  12. 20. ……………particle scattering was experiment by Rutherford that gave ideas about the atom structure.
  13. 21. electrons are arranged in these
  14. 26. This type of radioactive decay is an electromagnetic wave