matter

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Across
  1. 2. the answer is mas + one s
  2. 6. a group of atoms bonded together
  3. 8. how dense something is
  4. 9. a substance made of only one kind of atom
Down
  1. 1. Area x length x height
  2. 2. 2 or more types of atoms that aren't chemically bonded
  3. 3. something that matter takes up
  4. 4. 2 or more atoms that are chemically bonded
  5. 5. how heavy something is
  6. 7. the most basic form of matter