3.10 Crossword Puzzle B chem unit 2

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Across
  1. 2. ___-223 is a type of radioactive isotope used in radiation therapy
  2. 3. Isotope of hydrogen (H-2)
  3. 10. Isotope of hydrogen (H-1)
  4. 11. the atomic ____ of an element never changes
  5. 14. both atoms have 29 protons, but one isotope of this element has 34 neutrons, where another has 36
  6. 15. Isotope of Hydrogen (H-3)
  7. 18. ___ isotopes are used to kill cancer cells
  8. 20. this element has an atomic number of 1, but has 3 known isotopes
  9. 21. the difference in atomic mass is caused by different number of ___ in the nucleus
Down
  1. 1. ____-67 is a type of radioactive isotope used in radiation therapy
  2. 4. U-235 and U-238 are isotopes of this element
  3. 5. C-12 and C-14 are isotopes of this element
  4. 6. ___ therapy is a type of cancer treatment
  5. 7. ____-18 is a type of radioactive isotope used in radiation therapy
  6. 8. B-10 and B-11 are isotopes of this element
  7. 9. the atomic mass on the periodic table is usually a decimal because it is an ____ of all the isotopes of that element
  8. 10. all atoms of the same element have the same number of____
  9. 12. all elements have ____ or more isotopes
  10. 13. occurs when cells cannot control their growth and development
  11. 16. atom of an element with the same number of protons as the other atoms but a different number of neutrons
  12. 17. atoms of the same element can have different atomic ____
  13. 19. ____-123 is a type of radioactive isotope used in radiation therapy