Matter

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Across
  1. 4. :more than one group of atom; not chemically bonded
  2. 5. :building block
  3. 7. :group of one type of atom
Down
  1. 1. :combined atoms
  2. 2. :chemically bonded
  3. 3. :not mixed with anything; plain
  4. 6. :everything with mass and space