Question

True or False
Dobernier classified elements into sets of three chemically similar elements called triads.

Answer 1

In the year 1829, Johann Wolfgang Dobereiner, was the first to classify elements into groups based on John Dalton's assertions. He grouped the elements with similar chemical properties into clusters of three called Triads. The distinctive feature of a triad was the atomic mass of the middle element. When elements were arranged in order of their increasing atomic mass, the atomic mass of the middle element was approximately the arithmetic mean of the other two elements of the triad.