Atomic Theory

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