Matter crossword

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Across
  1. 2. a pure substance made up of only one type of atom.
  2. 5. the change of state from a solid to a liquid
  3. 7. describes the amount of matter in an object
  4. 9. the basic building blocks of matter
  5. 10. contains a variety of elements and compounds that are not chemically combined
  6. 12. the amount of space that an object takes up
  7. 14. a substance particle with no electrical charge
  8. 15. a substance that has definite volume but not a definite shape.
Down
  1. 1. something that takes up space and has mass
  2. 2. a subatomic particle with negative electrical charge
  3. 3. the number of protons in the nucleus of one of its atoms
  4. 4. a subatomic particle that has a positive electrical charge
  5. 6. a substance that doesn't have a definite shape or volume.
  6. 8. a substance that has definite shape and volume
  7. 11. a particle made up of different kinds of atoms chemically combined.
  8. 13. the measure of the amount of mass in a given volume