Atomic mass of X and Z is 20 and 40 respectively. If X, Y and Z is Dobereiner's Triad. What can be the atomic number of Y?
A
20
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B
40
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C
30
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D
All of these
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Solution
The correct option is C
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.