mod 3 vocab

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Across
  1. 2. avg mass of isotopes of the element
  2. 4. particles that leave radioactive materials
  3. 9. result of changes in an atoms nucleus
  4. 10. stream of electrons
  5. 11. accounts for energy lost during radioactive decay
  6. 13. mass 1/12 of carbon 12 atom
  7. 16. smaller atom w a positive charge of 1+
  8. 18. negative particle;moves around nucleus
  9. 19. the amt of protons in an atom
  10. 20. 1- charge;released during radioactive decay
Down
  1. 1. unstable nucli release radiation,losing energy
  2. 3. particle w 2+ charge; released during radioactive decay
  3. 5. the building block of everything
  4. 6. mass almost equal to a proton
  5. 7. negatively charged particles
  6. 8. shows atomic and mass number of particles involved
  7. 12. radiation that is positively charged; directed btw 2 charged plates
  8. 14. same atoms different amts of neutrons
  9. 15. represents sum of protons and neutrons
  10. 17. some things give off radiation