Chemistry of Chemistry

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Across
  1. 2. Located in the nucleus of an atom and has no electrical charge
  2. 4. Contains two or more different substances, some of which are not chemically combined together
  3. 5. Cu
  4. 7. A number used to arrange the Periodic Table
  5. 9. H
  6. 10. Contains only one type of atom
Down
  1. 1. Contains two or more different types of atoms, chemically bonded together.
  2. 3. Located outside of the nucleus of an atom
  3. 6. Located in the nucleus of an atom and has a positive charge
  4. 7. Ar
  5. 8. He