Question

whats are bobereniner's trade

Answer 1

Dobereiner made groups of three elements each , having similar chemical properties and called them traids.He arranged the three elements in a triad in an increasing order of atomic mass and showed that the atomic mass of the middle element was approximately equal to the mean of the atomic masses of the other two elements.

EX:- lithium ( Li ) , sodium ( Na ) , Potassium ( K) form a Dobereriners triad.

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Answer 2

Johann Wolfgang Dobereigner, a German chemist, tried to arrange the elements in groups of three in such a way that the atomic mass of the middle element was roughly equal to the average of the other two (only when they are arranged in the increasing order of atomic masses) .
Example : Chlorine (Cl)
Bromine (Br)
Iodine (l)

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