Across
- 2. The proton number is 6
- 3. This is located in the noble gases
- 6. This element's atomic number is 23
- 7. First on the periodic table
- 8. The neutron number is 30
- 11. The element symbol is NO
- 12. This element is an alkaline earth metal
- 13. salt formers
Down
- 1. The electron number is 36
- 3. This element is a post-transition metal
- 4. The atomic number is 32
- 5. This element is used to make toothpaste
- 9. This is an element that was found in London
- 10. This is the first element in group 18