Chemistry Puzzle

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Across
  1. 1. The only two letters to not officially appear on the periodic table (2 letters)
  2. 3. An acid that ionizes slightly in a solution (2 words)
  3. 5. This type of electromagnetic radiation is used for telecommunications around the world
  4. 6. The maximum amount of solute that can be dissolved into a solvent at a given temperature
  5. 8. A name given to all intermolecular forces (4 words)
  6. 11. A common name for Calcium Carbonate
  7. 15. This alcohol is commonly digested
  8. 17. The theoretical boundary around a black hole past which no radiation can escape (2 words)
  9. 19. The nuclear reaction that takes place in the sun’s core
  10. 20. Approximate solution for x: The speed of light/The speed of sound = 10x
  11. 21. The colour with the longest wavelength
Down
  1. 2. This type of spin is an angular momentum carried by electrons (2 words)
  2. 4. A base that produces few hydroxide ions when dissolved in water (2 words)
  3. 7. The smallest length, theoretically (2 words)
  4. 9. A solid solution of two or more metals
  5. 10. This subatomic particle is released during beta decay
  6. 12. This element is added to table salt for its health benefits
  7. 13. The lowest theoretical temperature (2 words)
  8. 14. The densest liquid element
  9. 16. The nucleus of this element is released during alpha decay
  10. 18. The final part of the standard model to be discovered (2 words)