Question

Elements A, B and C constitute a Dobereiner’s triad. The atomic mass of A is 20 and that of C is 40. Predict the atomic mass of B.

Answer 1

Answer:

atomic mass of B is 30

Explanation:

According to doberneir traid atomic mass of 2nd element like B is equal to average of the atomic mass of 1st nd 3rd elements like A nd C

A+C/2=20+40/2 =60/2 =30

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Answer 2

Answer:

Atomic mass of B = 40 + 20 = 60

Explanation:

60/2=30