Across
- 2. same number as protons
- 8. initiated idea of atoms, but couldn’t prove
- 9. discovered and identified nucleus and protons
- 11. asserted that matter is composed of hyles
- 12. same element, different masses
- 14. came up with scientific method
- 15. came up with atomic theory
- 17. fixed Mendeleev’s table using atomic number
Down
- 1. discovered and identified neutrons
- 3. listed and organized elements by appearance
- 4. protons plus neutrons
- 5. used to identify element with atomic number
- 6. added to protons to get mass
- 7. identified exact charge on electrons
- 10. difference between protons and neutrons >15
- 13. discovered and identified electrons & cathode ray
- 16. published first periodic table