The Atom

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Across
  1. 3. Earth, wind, fire and ______
  2. 5. home of protons and neutrons
  3. 7. the lightest element
  4. 8. subatomic particle with negative charge
  5. 12. weight of atom: atomic ______
  6. 13. where electrons hang out
  7. 15. greek word meaning indivisible
  8. 17. atoms of the same element with different number of neutrons
  9. 20. the element He
  10. 21. atome symbol for magnesium
Down
  1. 1. subatomic particle with no charge
  2. 2. element with 9 protons
  3. 4. like charges ______
  4. 6. tutor for Alexander the Great
  5. 9. atomic symbol for lithium
  6. 10. the element C
  7. 11. opposite charges ______
  8. 14. radioactive element
  9. 16. created atome model featuring electons in rings
  10. 18. subatomic particle with positive charge
  11. 19. element withn 11 electrons