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GK QUESTION#3503

In which year did AEB de Chancourtois organise the elements by atomic weight, by graphing the elements around a cylinder with a circumference of 16 units, corresponding to the weight of oxygen (O)?

  1. A1862Correct answer
  2. B1860
  3. C1870
  4. D1868
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Answer

A. 1862

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Explanation

De Chancourtois published the telluric screw in 1862. He plotted elements by atomic weight around a cylinder with one turn corresponding to an increase of 16 units, bringing some chemically similar elements into vertical alignments. It was an early periodic arrangement, rather than the modern atomic-number table.

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