crossword puzzle chem project

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Across
  1. 2. made the plum pudding model
  2. 3. what were all atoms known as before 1990
  3. 5. experiment run by JJ Thomspon
  4. 6. negative charge
  5. 8. father of the periodic table
  6. 10. smallest particle of matter
  7. 11. where is most of the mass in an atom located
  8. 12. number - atomic number= # of Neutrons
  9. 15. plum pudding experiment
  10. 18. no charge
Down
  1. 1. what charges was a proton have
  2. 4. atoms with the same number of protons but different amount of neutrons
  3. 7. Oxygen-17, with an atomic number of 10, has ? neutrons
  4. 9. said that atoms come in different shapes and sizes
  5. 13. the greek word for atom
  6. 14. the atomic number is also the number of…
  7. 16. came up with the atomic theory
  8. 17. How many protons are in hydrogen’s less common isotopes Hydrogen-2 and hydrogen-3?