The Atom

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Across
  1. 1. atomic mass unit
  2. 4. Joe who?
  3. 5. same element with different number of neutrons
  4. 9. the element abbreviated Fe
  5. 10. the element abbreviated Hg
  6. 12. created the quantum model of the atom
  7. 13. the element that has 54 protons
  8. 15. a charged atom or molecule
  9. 17. the element that has 6 protons
  10. 18. performed the gold foil experiment
  11. 19. the element that has 1 proton
Down
  1. 1. building blocks of matter
  2. 2. positively charged subatomic particle
  3. 3. number of protons and neutrons in the nucleus
  4. 6. the element that has 19 protons
  5. 7. created the planetary model of the atom
  6. 8. number of protons in an element
  7. 11. a specific kind of atom
  8. 14. negatively charged subatomic particle
  9. 16. neutrally charged subatomic particle
  10. 20. the element abbreviated Au