Across
- 1. Positively Charged Rays
- 6. Discovered the positive sub-atomic particle.
- 7. Its isotope is used in the treatment of goitre
- 8. Combining capacity of the atom.
- 12. Gold Foil Experiment
Down
- 2. Electrons
- 3. Valency=2, Symbol begins with S
- 4. Different Chemical Properties, Similar Physical Properties
- 5. the true atomic model that we use in chemistry today
- 9. Sub-atomic particles are known as
- 10. Chadwick's Contribution
- 11. 10