State of Matter

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Across
  1. 2. Sum of the protons and neutrons in the nucleus
  2. 8. Atoms of the same element that have different numbers of neutrons and different mass numbers
  3. 9. Gas or vapor changes directly from a solid without changing into a liquid
  4. 11. Negatively charged subatomic particle found in the space outside the nucleus
  5. 12. Caused by the collisions of the vapor and walls of the container
  6. 16. Number of protons in an atom
  7. 18. System absorbs energy from its surroundings
  8. 19. Neutral subatomic particle found in the nucleus of an atom
  9. 20. System releases energy into its surroundings
  10. 21. Direct relationship between volume and gas
Down
  1. 1. Positively charged subatomic particle that is found in the nucleus
  2. 3. Temperature of 0K
  3. 4. Changes from a gas to a liquid
  4. 5. Substance changes from one state of matter to another
  5. 6. Volume of a gas is inversely proportional to its pressure if the temperature and number of particles are constant
  6. 7. Result of a force distributed over an area
  7. 10. Changes from liquid to gas
  8. 13. Changes from a solid to a gas without changing to a liquid
  9. 14. Amount of energy released or absorbed
  10. 15. Dense, positively charges mass located in the center of the atom
  11. 17. One gram of water gains 2261 joules of energy