Atomic Theory Crossword Puzzle

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