the undiscovered element ----------

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Across
  1. 2. a chemist does this on 2 wheels
  2. 3. do this round the Backs
  3. 5. from the apothecary
  4. 6. Leavers' supper entertainment
  5. 8. PJ's topic of choice
  6. 13. not too many planets like this one
  7. 14. down under devil
  8. 15. the first one goes with a bang
  9. 17. 32 not out
Down
  1. 1. there are 3 of these in science dept
  2. 4. the Queen breathes this
  3. 5. plants do this 24/7
  4. 7. friday afternoon fun
  5. 9. Real Science?
  6. 10. new HOD
  7. 11. mobile chemistry
  8. 12. hornets f.c
  9. 16. not a banjo