On This Day In Chemistry

January 20th

French geologist and mineralogist Alexandre-Emile Béguyer de Chancourtois was born on this day in 1820

He was the first person to organise elements by atomic weights, by plotting a graph of the elements around a cylinder with a circumference of 16 units corresponding to the weight of oxygen (O). Elements that appeared above and below each other shared similar periodic properties.

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