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