Beginner's Luck (Easy)

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Across
  1. 5. Seven
  2. 7. Shell
  3. 9. Type of mixture
  4. 12. Wave period
  5. 13. Solute + solvent
  6. 14. Not neutral
  7. 15. Type of gas
  8. 18. Reaction accelerant
  9. 19. Chemical equation species
  10. 20. 6.02x10^23
  11. 21. Proton acceptor
Down
  1. 1. Phase change
  2. 2. Atomic linkage
  3. 3. Pressure unit
  4. 4. Temperature unit
  5. 6. Radioactive elements
  6. 8. _______ flask
  7. 10. On target
  8. 11. Concentration unit
  9. 16. Chlorine or bromine
  10. 17. Element number 16
  11. 18. Heat unit