C27

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Across
  1. 3. Semiconductor used in electronics
  2. 6. Element important in DNA
  3. 9. Element essential for respiration
  4. 10. Second element on the table
  5. 12. First metalloid
  6. 14. Group 2 element with atomic number 4
  7. 15. First alkali metal
Down
  1. 1. Basis of organic chemistry
  2. 2. Major component of air
  3. 4. Gas used in bright signs
  4. 5. Most electronegative element
  5. 7. Yellow nonmetal element
  6. 8. Common lightweight metal
  7. 11. Lightweight metallic element
  8. 13. Alkali metal in table salt