periodic table crossword puzzle

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Across
  1. 3. Found in glass and computer chips (7 letters)
  2. 5. This element’s symbol is H (8 letters)
  3. 9. Found in table salt (8 letters)
  4. 10. soft metal that reacts with water (7 letters)
  5. 11. Used in pencils and diamonds (6 letters)
  6. 12. Symbol is Na (6 letters)
Down
  1. 1. This element strengthens bones (7 letters)
  2. 2. The gas used in glowing signs (4 letters)
  3. 4. The element that’s essential for breathing (8 letters)
  4. 6. Shiny,never rusts, very expensive (4 letters)
  5. 7. Used to make foil, very light (9 letters)
  6. 8. Its symbol is Fe, known for strength (4 letters)