Chemistry crossword

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Across
  1. 2. chemical symbol: H
  2. 3. another word for burning something
  3. 5. Periodic Table of the Elements
  4. 7. the equipment
  5. 8. Its bones have been replaced with minerals
  6. 9. they have good thermal conductivity
Down
  1. 1. harmful or damaging
  2. 4. Chemical symbol: O
  3. 6. Chemical symbol: Li
  4. 7. low on the pH scale