States of Matter

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Across
  1. 1. a positively charged particle in an atom's nucleus
  2. 6. the phase change in which a gas changes to a liquid
  3. 9. a negatively charged particle that moves in an orbit shell outside an atom's nucleus
  4. 11. the phase change in which a liquid changes to a gas
  5. 12. a chemical substance that is made up of two or more different kinds of atoms that are bonded together
  6. 13. a combination of two or more types of matter in which the components retain their individual properties
Down
  1. 2. the central portion of the atom containing protons and neutrons
  2. 3. the temperature at which a substance begins to change phases from liquid to gas
  3. 4. how tightly the molecules are packed together in the solid object, liquid or gas
  4. 5. the temperature at which a substance begins to change phases from solid to liquid
  5. 7. the phase change in which a solid becomes a gas, bypassing the liquid phase
  6. 8. the number of protons in an atom's nucleus
  7. 10. the combined mass of protons and neutrons in an atom