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Question

Elements x, y and z forms Dobereiner's triad. If the atomic mass of element x and z are 7 and 39 respectively, then what is the atomic mass of element y?

A
23
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B
46
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C
16
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D
32
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Solution

The correct option is A 23
In a triad, the relative atomic mass of middle element is approximately equal to arithmatic mean of the relative atomic mass of first and third elements.
Hence the atomic mass of y =7+392=23

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