Chemistry crossword

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Across
  1. 2. protons+neutrons
  2. 4. energy traveled through light
  3. 9. splitting or joining of a nucleus
  4. 10. emitted in a vacume tube
  5. 11. the shortest wavelength and highest energy
  6. 13. 1.66 x 10^27 kg
  7. 16. has a positive charge of 1+
  8. 18. A negatively charged particle found in all types of matter
  9. 19. the number of protons in an element
  10. 20. high speed electrons
Down
  1. 1. change of atoms once it becomes unstable
  2. 3. two protons an two neutrons bonded together
  3. 5. the smallest particle of an element
  4. 6. has a mass nearly equal to that of a proton
  5. 7. the transmutation of a neutron into a proton and an electron
  6. 8. desribes a nuclear reaction
  7. 12. when the nucleus of an atom becomes unstable
  8. 14. same atomic number but different mass number
  9. 15. number of protons and neutrons in a nucleus
  10. 17. products that are part of radioactive decay