periodic table

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Across
  1. 3. what is on the second row and second column
  2. 4. what do plants create using photosynthesis
  3. 7. What is the element after potassium
  4. 11. what was founded by James W. Marshall
  5. 12. what is needed by all living tissue
  6. 15. what is the third most abundant gas in earth atmosphere
  7. 16. what element has the atomic mass of 35.45
  8. 17. what is 2/3 the density of air
  9. 18. what is the lightest element
  10. 19. what element can be found inside soil, plant,food, and water
  11. 20. what is the lightest halogen to exist
Down
  1. 1. what has the atomic number of 30
  2. 2. what is the five cent coin
  3. 5. what element has the symbol N
  4. 6. what the symbol Li on the periodic table for
  5. 8. what is the second most abundant element in the crust
  6. 9. what is the first element in group 6
  7. 10. what were the coins made out of in the 8000 B.C.E
  8. 13. what is tableware made out of?
  9. 14. what are springs made out of