Atoms crossword puzzle

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Across
  1. 1. characteristics that describe the ability of a substance to become something else
  2. 3. the basic unit from which all matter is made
  3. 4. the amount of space that matter occupies
  4. 7. a group of two or more atoms held together by chemical bonds
  5. 11. the scientific word for stuff or anything that has mass or takes up space.
  6. 12. a single kind of matter that always has a specific makeup
Down
  1. 2. is made up of two or more substances that are together in the same place
  2. 5. the amount of matter in an object
  3. 6. a substance made of two or more elements that are chemical combined in a ratio
  4. 8. substances that are made up of only one type of atom
  5. 9. a measure of the force of gravity on an object
  6. 10. properties a characteristic that can be observed without changing the matter into another type of matter