Elements, compounds, and mixtures.

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Across
  1. 4. Group of atoms held together with chemical bonds
  2. 5. Resulting from a reaction between two substances
  3. 7. Atoms of the same type grouped together
  4. 8. Different types of substances physically mixed together
  5. 10. A particular kind of matter
Down
  1. 1. A part of an element
  2. 2. The basic unit of a chemical element
  3. 3. Anything that takes up space
  4. 6. Relating to the periodic table
  5. 9. A measure of the amount of mass in something