Three elements X, Y and Z form a Dobereiner triad. The atomic weights of X and Z is in the ratio 5 :17. If the sum of the atomic weights of extreme elements is 176, then find the atomic weights of Y.

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Solution

The correct option is A 88
X and Z are the extreme elements. Therefore,
5x+ 17x = 176
22x = 176
x = 8
Atomic weight of X= 58= 40
Atomic weight of Z= 178= 136
Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad.Therefore,

Atomic mass of Y = average of atomic mass of X and Z
= (40 + 136) / 2
= 88

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