# A, B and C Are the Elements of a Dobereiner'S Triad. If the Atomic Mass of a is 7 and the of C is 39, What Should Be the Atomic Mass of B? - Science

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

#### Solution

A, B and C are the elements of a Dobereiner's triad. If the atomic masses of A and C are 7 and 39 respectively, then according to Dobereiner's triad law, the atomic mass of B is the average of the atomic masses of A and C.

So, the average of the atomic masses of A and C =(7+39)/2= 46/2=23
Therefore, the atomic mass of B is 23.

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#### APPEARS IN

Lakhmir Singh Class 10 Chemistry (Science)
Chapter 5 Periodic Classification Of Elements
Q 6 | Page 282

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