Science Crossword

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Across
  1. 2. number 20 on periodic table
  2. 9. OH
  3. 10. CO3
  4. 11. Sodium chloride burns the color_____?
  5. 12. PO4
  6. 15. outside of the atom
  7. 16. PH7
  8. 17. neutral charge
  9. 19. SO3
Down
  1. 1. number 50 on periodic table
  2. 3. PH4
  3. 4. number 8 on periodic table
  4. 5. Potassium chloride burns the color_____?
  5. 6. number 5 on periodic table
  6. 7. HCO3
  7. 8. Copper(II) sulfate burns the color_____?
  8. 12. positive charge
  9. 13. number 47 on periodic table
  10. 14. PH10
  11. 18. Calcium chloride burns the color______?