Chemistry final crossword

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Across
  1. 2. anything having mass and taking up space
  2. 6. one of states of matter
  3. 8. spectrum chemical element or chemical compound
  4. 9. fusion when two or more nuclei together
  5. 11. able to be changed
  6. 12. something becomes a liquid by heat
  7. 13. bang how the universe began
  8. 14. when water becomes a solid
  9. 16. how far is it from starting cycle to ending cycle
  10. 18. are dark planet-sized regions that appear on the sun
  11. 20. one complete performance of a periodic process
  12. 21. light from the sun
  13. 23. having a PH of less than 7
Down
  1. 1. the basic unit of matter
  2. 3. a rearrangement of atoms into new substances
  3. 4. lighter elements sometimes have too many neutrons
  4. 5. mountain or hill which having lava
  5. 7. matter and space as a whole
  6. 10. type of rocks
  7. 15. atoms of same elements having a different mass
  8. 17. all atoms with more than 82 protons are radioactive
  9. 18. the relative amount of solute
  10. 19. table of chemical elements
  11. 20. microwave type of big bang theory
  12. 22. send into the air