Elements,compounds,mixtures

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Across
  1. 3. number on the periodic table
  2. 6. -
  3. 7. stable
  4. 10. 2 or more elements
Down
  1. 1. kind of matter
  2. 2. a mix of something
  3. 4. a substance that takes up space
  4. 5. +
  5. 8. periodic table
  6. 9. building blocks