Chemistry final crossword

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