Alexandre Beguyer de Chancourtois (1820-1886)
oIn 1863, a 44 year old French geologist, he created a list of the elements arranged by increasing atomic weight. The list was wrapped around a cylinder so that several sets of similar elements lined up, creating the first geometric representation of the periodic law.
oIn 1862 was the first person to make use of atomic weights to reveal periodicity (i.e. when the elements were arranged according to their atomic weights, similar elements seemed to occur at regular intervals.) He drew the elements as a continuous spiral around a cylinder divided…
