Chemistry

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Across
  1. 2. unit of a chemical element
  2. 5. group of atoms bonded together
  3. 7. of compactness of a substance
  4. 9. freely but of a constant volume
  5. 10. substance of The Periodic Table of Elements
  6. 11. with a neutral charge
  7. 12. freely to fill any space available
Down
  1. 1. thing that is composed of two or more seperate elements
  2. 3. and stable in shape
  3. 4. with a positive charge
  4. 6. chemical element with the atomic number 6
  5. 8. with a negative charge