Across
- 2. colorless and odorless gas 17
- 5. most chemically reactive element
- 7. The U.S. Penny is 98% of this , with a copper coating.
- 11. metal when warmed is soft enough to cut w / a butterknife .
- 14. can be used to make jewerly
- 15. used in thermometers ( also a planet ^-^ )
- 16. second lightest element
- 17. the most abundant element in the universe.
- 18. pure element that makes about 5.6 of the crusts surface
Down
- 1. used to make small lightweight composites
- 3. symbol of pd
- 4. made in many stars . ( its bright & glowy )
- 6. atomic number is 53
- 8. used in pools
- 9. 45% lighter then steel
- 10. covering of a penny
- 11. non toxic
- 12. animals and plants require this to stay alive
- 13. most common element in the human body
- 19. you use this element to straighten your clothes (: