Chemistry

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Across
  1. 2. The basic unit of a chemical element
  2. 5. The degree of compactness of a substance
  3. 6. A compound or substance that has been purified or prepared
  4. 9. A thing that is composed of two or more separate elements
  5. 10. A subatomic particle of about the same mass as a proton but without an electric charge
Down
  1. 1. A physical substance
  2. 3. An element is a substance that cannot be broken down into any other substance
  3. 4. An element whose properties are intermediate between those of metals and solid nonmetals or semiconductors.
  4. 7. A substance that is formed as the result of a chemical reaction
  5. 8. A subatomic particle occurring in all atomic nuclei, with a positive electric charge