atomic structure and radiation

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Across
  1. 5. which type of radiation is made up of 2 protons and 2 neutrons
  2. 9. during ionisation, radiation hits an atom and removes which particle?
  3. 11. alpha radiation has a charge of +_ _ _
  4. 12. which type of radiations is an electromagnetic wave
  5. 13. this element has the symbol 'Sc'
  6. 16. this particle is found in the nucleus and has no charge
  7. 18. sodium (Na), lithium (Li) and potassium (K) are all found in this group on the periodic table
  8. 20. this particle has a negative charge - it orbits the nucleus in shells
Down
  1. 1. alpha radiation is easily stopped by things like p _ _ _ _
  2. 2. this element has the symbol Mg
  3. 3. this element contains 6 neutrons but it is NOT Boron
  4. 4. this particle has a positive charge, found in the nucleus
  5. 6. beta radiation is quite penetrating, but it can be stopped by a few mm of a_ _ _ _ _ _ _ _
  6. 7. gamma radiation has z_ _ _ charge
  7. 8. which type of radiation is made up of one electron
  8. 10. this metal is very good at absorbing radiation
  9. 14. exposing the body to high levels of radiation can cause...
  10. 15. beta radiation has a _ _ _ _ _ _ _ _ charge
  11. 17. this element contains 8 protons
  12. 19. this element contains 9 protons and 10 neutrons