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Dobernier's Triads

In a Doberein...

Question

In a Dobereiner’s triad, the respective atomic masses of the first and the last elements are 40 and 137

What is the mass of the middle element of the triad?

A

177

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B

128

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C

88

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D

49

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Solution

The correct option is C
88

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Li (6.9), Na (X), K (39.0).

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