Atomic theory crossword puzzle

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Across
  1. 2. : Needed for electrons to move levels
  2. 3. : Modern idea of where electrons are found
  3. 5. : Said electrons move in energy levels around the nucleus
  4. 6. : Positive particle in the nucleus
  5. 8. : Neutral particle in the nucleus
  6. 10. : Path electrons take around the nucleus
  7. 14. : Center of the atom
  8. 15. : Explanation based on evidence
  9. 16. : A way to show or explain something
Down
  1. 1. : Greek philosopher who said matter is made of tiny indivisible particles called atomos
  2. 4. : Proposed the first atomic theory with atoms as indivisible and combining in whole numbers
  3. 7. : Discovered the electron using the cathode ray tube
  4. 9. : Negative particle moving around the nucleus
  5. 11. : Found the nucleus with the gold foil experiment
  6. 12. : How much matter is in something
  7. 13. : Smallest part of matter