Across
- 2. its the heaviest of the stable halogens
- 6. its atomic mass is 39.948u
- 8. it makes four electrons available to form a covalent bond
- 9. atomic number of 92
- 10. element with the atomic number of 19
- 12. has the atomic mass of 20.1797u
Down
- 1. is relatively rare in the universe
- 3. it's the lightest halogen and is highly toxic
- 4. the electronegativity of this is 2.04
- 5. has the atomic mass of 27
- 7. has 56 electrons and is in group 2
- 11. is highly reactive nonmetal