Radiation recap

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Across
  1. 1. this is the name for the centre of an atom - it contains the protons and neutrons
  2. 4. this type of radiation is a wave with no charge
  3. 6. this type of radiation has a negative charge
  4. 7. this metal is very good at absorbing gamma radiation - it has the symbol 'Pb'
  5. 9. I am found in group 5 on the periodic table - I have the symbol 'N'
  6. 11. a few mm of this metal will stop beta radiation - it has the symbol 'Al'
Down
  1. 2. this element has the symbol 'U' and is radioactive
  2. 3. Chlorine is found in this group on the periodic table
  3. 5. this type of radiation has a charge of +2
  4. 8. paper or _ _ _ _ will stop alpha radiation
  5. 10. this is the percentage of radiation remaining after one half life