periodic table crossword

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Across
  1. 2. No fixed shape
  2. 4. Nuclear fuel element
  3. 8. Needed to breathe
  4. 11. One type of atom
  5. 14. Loss of electrons
  6. 18. No charge particle
  7. 19. Battery metal
Down
  1. 1. pH above 7
  2. 3. Formed from acid + base
  3. 5. Smallest unit of matter
  4. 6. Negative particle
  5. 7. Prevents rust on iron
  6. 9. Table column
  7. 10. Table row
  8. 12. Yellow, smelly element
  9. 13. Holds atoms together
  10. 15. Charged atom
  11. 16. pH below 7
  12. 17. Positive particle