SCIENCE

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Across
  1. 1. Ferrous sulfate
  2. 4. Sodium chloride
  3. 6. carbon monoxide
  4. 8. carbon oxide
  5. 9. cuprous chlorine
  6. 11. aluminum chloride
  7. 12. Sodium oxide
  8. 14. atomic number 79
  9. 17. atomic number of 92
  10. 18. mercuric oxide
  11. 19. is a chemical element
  12. 20. melting point 3,000 °C (5,432 °F)
Down
  1. 2. atomic number 14
  2. 3. calcium oxide
  3. 5. aluminum oxide
  4. 6. cupric chlorine
  5. 7. atomic number 82
  6. 10. mercuric chlorine
  7. 13. aluminum nitride
  8. 15. metal is soft enough to be cut with a knife
  9. 16. atomic number 26