Across
- 4. a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
- 8. p
- 10. center is dense
- 11. electron cloud
- 13. electron
- 14. 1913
- 16. nuclear model 1911
- 18. developed the first periodic table
Down
- 1. n
- 2. bohr model
- 3. is the smallest particle of an element that still has the properties of that element. example h20
- 5. 400 bc
- 6. space, shells, energy levels
- 7. plum pudding model
- 9. e
- 12. 1926
- 15. protons
- 17. solid sphere model was made by who