NATIONAL PERIODIC TABLE DAY

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Across
  1. 1. Element that forms millions of compounds
  2. 4. An example for nuclear fuel
  3. 6. Liquid non-metal
  4. 9. First metal used by man
  5. 11. Heaviest element by atomic weight
  6. 12. Lightest gas
  7. 14. Wonder metal
  8. 15. Metal ion that shows apple-green flame
  9. 19. Abundant ELEMENT in the earth's crust
  10. 20. A non-metal used to preserve food material
Down
  1. 2. Most abundant metal in the earth's crust
  2. 3. An example of a semiconductor
  3. 5. An alloy of copper and zinc
  4. 7. Deficiency causes anemia
  5. 8. An allotrope of carbon
  6. 10. Metal which can be cut with a knife
  7. 13. Metal used in galvanisation
  8. 16. Inert gas used in tungsten filament bulbs
  9. 17. Liquid metal at room temperature
  10. 18. Most malleable metal