Crossword Puzzle

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Across
  1. 2. Discovered by Sir Humphry Davy of Britain
  2. 3. Discovered by Henry Cavendish of Britan in 1766
  3. 6. Discovered by Marguerite Perey of France
  4. 9. Discovered in 1898 by Sir W.Ramsay and M.Travers of Britain
  5. 10. Discovered in 1817 by Johann Arfvedson of Sweden
  6. 13. Discovered by P.Janssen of France in 1868
  7. 14. Discovered by Sir Hhymphry Davy of Britain in 1807
  8. 15. Discovered in 1791 by William Gregor of Britan
Down
  1. 1. Discovered in 1907 by Georges Urbain of France
  2. 4. Discovered by Sir W. Ramsay and M.Travers of Britain in 1898
  3. 5. Discovered in 1735 by George Brandt of Sweden
  4. 7. Discovered by Basil Valentine of Germany
  5. 8. Discovered by Louis Nicolas Vauquelin of France
  6. 11. Discovered in 1879 by Per Teodor Cleve of Sweden
  7. 12. Discovered by J.Berzelius and W.von Hisinger of Sweden in 1803