If elements A, B and C form a Dobereiner's triads, then, atomic mass of element B is arithmetic mean of atomic masses of A and C.

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Elements A,B,C forms Dobereiner's triads. If atomic mass of element A is 7 and the atomic mass of element C is 39. Then atomic mass of element B is

(a) A, B and C are the elements of Dobereiner's triad. If the atomic mass of A is 7 and that of C is 39, what should be the atomic mass of B?

(b) Why was the Dobereiner triad discarded?

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