Science Crossword Puzzle

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Across
  1. 2. one of the three states of matter that can change in shape and volume
  2. 5. a group of combined atoms
  3. 6. the amount of space something takes up
  4. 8. a celestial body that of which is in orbit of the sun, and has enough mass for self-gravity
  5. 9. the amount of heat in something or somewhere
  6. 10. anything that takes up space
  7. 11. something made from multiple different elements that are chemically combined
  8. 15. one of the three states of matter,has a fixed shape and volume
  9. 16. particle with a positive electric charge
  10. 17. a common state of matter, an electrically charged gas
  11. 18. an atom and or molecule containing a net charge
  12. 20. the amount of mass in something
Down
  1. 1. found in nature, it cannot be broken or changed
  2. 3. the most basic unit of matter
  3. 4. organelle that contains chromosomes
  4. 7. particle with a negative charge
  5. 12. a material that is able to be easily reformed
  6. 13. particle with a neutral charge
  7. 14. the force (invisible) that pulls/keeps things together
  8. 19. one of the three states of matter that can change and adapt in shape but volumes stays the same