Question

1. in a triad of three elements A, B and C the atomic masses of Ais 75 and B is 125. Find
the atomic mass of element C.​

Answer 1

Answer:

100

Explanation:

125+75/2=100(the sum of first two element)

Answer 2

The atomic mass of element C is 175

Explanation:

Dobereiner's triads was a group of three elements. Dobereiner said that the relative atomic mass of the middle element in each triad was average of the relative atomic masses of the other two elements.

Thus if A, B and C forms Dobereiner's triads, the mass of B is average of mass of A and C.

$125=\frac{75+C}{2}$

$C=175$

Thus the atomic mass of element C is 175.

Learn more about Dobereiner's triads

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