Atomic Theory Crossword Puzzle

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Across
  1. 3. The surrounding orbits of an atom that electrons can jump to.
  2. 4. The amount of mass in an atom.
  3. 7. A substance that's made up of one type of atom
  4. 9. The smallest building block of a substance.
  5. 11. The number of protons in the nucleus of an atom.
  6. 12. Proposed the modern atomic theory.
  7. 14. Performed the Gold Foil Experiment.
  8. 16. A model of an atom that shows electrons circling the atom.
  9. 17. The center of an atom.
  10. 18. A negatively charged particle.
  11. 19. A substance that is made up of two or more bonded elements
  12. 20. A particle with no electric charge.
Down
  1. 1. An element whose atoms have different numbers of neutrons than protons.
  2. 2. The overall charge of an atom.
  3. 5. The outermost shell of an atom.
  4. 6. A model of an atom the only represented valence shell electrons.
  5. 8. The sharing of electrons between atoms.
  6. 10. The structure of the atom.
  7. 13. Experimented with cathode rays.
  8. 15. A particle with a positive electric charge.