Across
- 3. An inert noble gas used to prevent electronics from oxidating.
- 5. An alkaline earth metal with many uses in the body.
- 8. This element is 78 percent of earth's atmosphere.
- 9. Used often in balloons for their longevity.
- 10. Basic building block of all life.
- 11. A bright yellow nonmetallic element with a rotten smell.
- 13. A soft white metal that is vital in the human body.
- 16. Used in batteries.
- 17. A flammable gas that we breathe.
- 18. Used in semiconductors or electronics.
- 19. Has an atomic number of 20.
Down
- 1. A non metallic structural component in plant cell walls.
- 2. A brittle but strong metal that does not appear in nature by itself.
- 4. A highly reactive element that is not found in nature.
- 6. Used in glowing signs.
- 7. Has an atomic mass of 39.098.
- 9. Used in analytical chemistry for its ability to produce clean flames.
- 12. The most electronegative element.
- 14. The most common metal in earth's crust. This element is highly conductive.
- 15. Used to remove germs and gaseous at room temperature.