Across
- 5. what element has the symbol "K"?
- 7. What element is found in DNA and bones?
- 9. What element do humans need to breathe?
- 11. What metal burns with a bright white flame?
- 17. What element is added to toothpaste to prevent cavities?
- 18. What gas is used in bright advertising signs?
- 19. What metal is used in rechargeable batteries?
- 20. What element is found in emeralds?
Down
- 1. What element has the symbol "Na"?
- 2. What noble gas is used in light bulbs?
- 3. What element has the symbol "B"?
- 4. What does "Si" mean on the periodic table?
- 6. What lightweight metal is used in soda cans?
- 8. What is the first element on the periodic table?
- 10. What gas makes up most of Earth's atmosphere?
- 12. What element smells like rotten eggs?
- 13. What element is found in diamonds and graphite?
- 14. What element keeps bones and teeth strong?
- 15. What element is used to disinfect swimming pools?
- 16. What gas is used to fill balloons so they float?