Across
- 3. atomic mass is 83.798
- 5. atomic mass is 12.011
- 8. 12 protons and period 3
- 9. 1 proton and period 1
- 10. atomic mass is 92.906
Down
- 1. 26 protons and period 4
- 2. 29 protons and period 4
- 4. atomic mass is 178. 49
- 6. atomic mass is 132.91
- 7. 2 protons and period 1