Elements and the periodic table

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Across
  1. 4. JJ Thompson's model of the atom
  2. 8. compound produced in respiration
  3. 9. atomic number of 3
  4. 10. number of protons + number of neutrons
  5. 13. negatively charged sub atomic particle
  6. 14. proposed a solid sphere of the atom
  7. 15. elemnt with 20 protons
  8. 16. element with 7 protons
  9. 18. discovered electrons exist in shells
  10. 20. gas used for respiration
  11. 21. - the same before and after
Down
  1. 1. - same number of protons but different neutrons
  2. 2. first element of the periodic table
  3. 3. lement with 9 p and 10 n
  4. 5. atomic number of 11
  5. 6. first element in group 4
  6. 7. plum pudding model has none of this
  7. 8. discovered the neutron
  8. 11. discovered the nucleus
  9. 12. positive charged particle in the nucleus
  10. 17. elemnt with 26 protons
  11. 18. - third element in group 7
  12. 19. number of protons in the nucleus
  13. 22. neutral particle with mass of 1