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