Periodic Table of Elements

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Across
  1. 2. It is everywhere
  2. 4. In your salty chips
  3. 6. Abbreviation is He
  4. 9. Atomic number of 3
  5. 11. Formula is O₂
  6. 12. It is all through the air
Down
  1. 1. Comes before carbon in the periodic table
  2. 3. Abbreviation is Be
  3. 5. chlorophyll
  4. 7. For your teeth
  5. 8. Atomic number of 1
  6. 10. To light up the sign