Chemistry crossword puzzle

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