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Question

When a Dobereiner triad is considered, the sum of atomic weights of extreme elements X and Z is 177.6 and difference of Z and Y is five times the number of protons present in a neon atom. Identify X, Y and Z.

A
XCa,YSr,ZBa
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B
XLi,YNa,ZK
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C
XK,YRb,ZCs
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D
XSr,YBa,ZRa
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Solution

The correct option is A XCa,YSr,ZBa
The atomic weight of Y is avergae of X and Z
MY=177.62=88.8
88.8 is weight of Sr. So Y is Sr. According to this only option A is correct.

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