Q. 64.0( 12 Votes )

A, B and C are the elements of a 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?

Answer :

Mass of B is 23. According to Dobereiner the atomic weight of middle element is nearly the same as average of the atomic weight of other two elements.


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