Science Puzzle

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Across
  1. 2. Absorption of heat
  2. 4. The change of texture or shape
  3. 9. Compactness of a substance
  4. 10. you can find all the elements here
  5. 12. One element replaces another compound
  6. 16. Undergoes a change in a reaction
  7. 18. No electric charge
  8. 19. Positive electric charge
  9. 20. two of the same element,same amount of protons
Down
  1. 1. The process of rotting/decaying
  2. 3. Has a net electric charge
  3. 5. Heat and energy are produced
  4. 6. Two Ionic compounds are exchanged
  5. 7. The making of at least one new substance
  6. 8. The result of an action or process
  7. 11. Found on the left side of the periodic table
  8. 13. Two mathematical expressions
  9. 14. Release of heat
  10. 15. Negative Electric charge
  11. 17. Found on the right side of the periodic table