Chemistry crossword puzzle

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Across
  1. 3. When something changes physically.
  2. 4. When something changes chemically.
  3. 8. Conducts heat and electricity poorly.
  4. 9. Has all the element that have been discovered.
  5. 11. Make everything up in the Universe.
  6. 13. Positive charge.
  7. 14. Negative charge.
Down
  1. 1. Electrons on most outer Shell.
  2. 2. When two things mix chemically
  3. 5. Properties of metals and non-metals.
  4. 6. When two things don't mix chemically.
  5. 7. Conducts heat and electricity well.
  6. 8. No charge.
  7. 10. Pure substance.
  8. 12. Number of element on Periodic table.