Avery's Cool Crossword

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Across
  1. 4. a group of atoms bounded together
  2. 5. What you breathe
  3. 7. water is a _______ element
  4. 8. one of the three distinct forms matter can exist
  5. 11. chart or diagram that contains call the elements
  6. 12. state where liquid becomes gas
  7. 13. A state of matter that takes any form
  8. 14. core of an atom
Down
  1. 1. highly reactive with other metals
  2. 2. particle with a charge of negative electricity
  3. 3. A state of matter with no shape or volume
  4. 6. a pure substance that cannot be broken down by chemical means
  5. 9. Basic unit of a chemical element
  6. 10. Material which is made up of two or more different substances
  7. 15. The hardest of the three states of matter