Atomic mass of X and Z is 20 and 40 respectively. If X, Y and Z form a Dobereiner's triad then the value of Y is

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Solution

The correct option is B 30
The mass of middle element was roughly the average of atomic masses of other two elements in Doberner's triad. Since Y is the middle element of the triad, its mass should be the average of 20 and 40, i.e. 30.

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Atomic mass of X and Z are 20 and 40 respectively. If X, Y and Z are in Dobereiner’s triads, what should be the atomic mass of Y?

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