Looking Inside the Atom (Chapter 11)

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Across
  1. 2. an example of hydrogen isotope that contains one proton but no neutron
  2. 6. the simplest atom
  3. 7. an electrical discharge tube used to investigate cathode rays
  4. 10. are used in treating diseases in radionuclide therapy
  5. 12. he was the first to observe the existence of protons
  6. 15. the total number of protons and neutrons
  7. 16. positively charged ion
  8. 20. causes revolving objects to move away from the center
  9. 22. are emitted gamma rays when food undergo spontaneous decay
  10. 23. the number of protons in an atom
Down
  1. 1. he invented a tube which use contains cathode and anode
  2. 2. a particle with a mass calculated to be 1000+ times bigger than the electron
  3. 3. it is the second simplest atom
  4. 4. negatively charged ion
  5. 5. discovered neutron
  6. 8. these are atoms with the same atomic number but different number of neutrons
  7. 9. it is considered as the third subatomic particle
  8. 11. are very light negatively charged particles
  9. 13. isotopes that contain one proton and one electron
  10. 14. are atoms that carries a net electrical charge
  11. 17. it is a condition of atoms that has equal number of protons and electrons
  12. 18. are atoms that carry net charge
  13. 19. an isotope that is present in trace amounts in the atmosphere
  14. 21. it either gains or lose electrons