Across
- 6. what air is mostly made of
- 9. the first element
- 11. Sb-element number 51
- 12. one of the rarest metals on earth
- 13. with a melting point of over 3400 degrees Celsius
- 14. named after the person who managed to split an atom
- 15. the most common element
- 16. AU
Down
- 1. glows in the dark when exposed to oxygen
- 2. the first liquid element
- 3. elements 51 - 71
- 4. the 24th element
- 5. Superman
- 7. the first element which doesn’t begin with its first letter
- 8. What most life forms are made of
- 10. poisonous but was used in paint in the early 1900’s