Periodic Table Challenge

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Across
  1. 5. Heaviest element in Nature
  2. 7. The scientist who discovered the periodic table
  3. 8. A semimetal
  4. 9. The scientist who discovered the theory of relativity
  5. 14. Element in group 2 and period 6
  6. 16. Lightest element
  7. 18. A yellow solid nonmetal
  8. 19. Metal in the same group as carbon
Down
  1. 1. Makes up most of the air
  2. 2. The scientist who discovered Radium
  3. 3. The only liquid metal
  4. 4. Symbol for metal used to make bridges
  5. 6. Radioactive metal
  6. 8. Symbol for tin
  7. 10. Metal in the same group as carbon
  8. 11. Teh symbol for Lead
  9. 12. symbol for the lightest metal for its weight
  10. 13. Symbol for element in same group as oxygen
  11. 15. Symbol for silver
  12. 16. Second lightest element
  13. 17. Precious yellow metal