chemistry puzz

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Across
  1. 1. protons+nuetrons
  2. 5. commander
  3. 7. two or more forms of same element
  4. 9. bessels
Down
  1. 1. John dalton
  2. 2. ship
  3. 3. no charge
  4. 4. distance between identical points
  5. 6. hall
  6. 8. E