radioactive terms

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Across
  1. 2. radioactive isotope
  2. 3. discharge into air
  3. 5. short range attractive force that holds a nucleus together
  4. 7. a particle equal to an electron but with a positive charge
  5. 9. fast moving helium nucleus
  6. 10. force between elementary particles that causes radioactive beta decay and collisions
  7. 12. spontaneous emitting of radiation from an element
  8. 13. used to measure radiation
  9. 16. high speed electrons or positrons emitted from radioactive nuclei
  10. 17. atomic species where all atoms have the same atomic mass and mass number
Down
  1. 1. changing of one element to another through radioactive decay
  2. 4. observation that metals emit electrons when light shines on them
  3. 6. splitting of an atom
  4. 8. part of a nucleus, proton or neutron
  5. 11. nuclear reaction where two or more atomic nuclei collide combining together
  6. 14. time it takes for half of a radioactive nuclei to under go radioactive decay
  7. 15. electromagnetic radiation