Elements Crossword Puzzle

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Across
  1. 2. to keep swimming pools hygenic
  2. 3. Oganessian Latest discovered element
  3. 4. red stuff on the side of box of matchstick
  4. 7. -most expensive natural elements
  5. 8. most electrically conductive element
  6. 9. It is needed for the body's defensive (immune) system
  7. 10. in balloons
  8. 13. in production of glass
  9. 17. element name
  10. 19. abundant metal on earth
  11. 20. used in thermometer
Down
  1. 1. element in periodic table
  2. 4. symbol is K. It is found in bananas
  3. 5. most rarest element on earth
  4. 6. metal in periodic table
  5. 11. very heavy metal used for fishing sinkers
  6. 12. in bright signs for advertising
  7. 14. up 80% of the air we breath.
  8. 15. is the gas that we breath out
  9. 16. an essential element for blood production
  10. 18. lightest gas element