Atoms and the periodic table

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Across
  1. 2. orbiting the nucleus
  2. 6. by increasing atomic number.
  3. 8. electrons
  4. 11. that electrons
  5. 15. atomic number is a whole number.
  6. 16. protons.
  7. 17. used cathode ray to
Down
  1. 1. elements on the periodic table are arranged
  2. 3. gold foil
  3. 4. involving alpha
  4. 5. named neutrons
  5. 7. initiated term
  6. 9. small for the human eye to see
  7. 10. atomic number is always the same for a given element.
  8. 12. atomic number of an element is equal to the number
  9. 13. theorized that atoms are
  10. 14. can not be divided