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In dobereiner triad, the atomic weight ...

In dobereiner triad, the atomic weight of middle element is :

A

the sum of the atomic weights of `1^(st) and 3^(rd)` elements

B

the product of the atomic weights of `1^(st) and 3^(rd)` elements

C

the average of the atomic weights of the 1st and 3rd elements

D

the difference of the atomic weights of the 1st and 3rd elements

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