Across
- 2. Periods go a.....
- 4. Charge of an electron
- 8. Mg
- 9. Charge of an proton
- 10. Cl
- 11. atomic number of Sulphur
Down
- 1. Groups go d...
- 3. the atomic mass is equal to protons plus
- 5. Fe
- 6. the nucleus of an atom contains neutrons and ........
- 7. atomic mass of Sodium
- 8. Russian Chemist who created the periodic table