Periodic Table

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Across
  1. 3. full outer shell
  2. 4. semiconductors
  3. 9. discovered by Chadwick
  4. 11. arranged periodic table by atomic number
  5. 12. charge on neutron
  6. 13. found on outermost shell
  7. 15. discovered by JJ Thomson
  8. 16. charge on proton
Down
  1. 1. number of protons and neutrons
  2. 2. arranged periodic table by mass
  3. 5. current model of atom
  4. 6. number of protons
  5. 7. brittle
  6. 8. discovered by Rutherford
  7. 10. charge on electron
  8. 14. good conductors of heat and electricity