Which among the following group of elements does not form a Dobernier triad?

Sr, Ba, Ca

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Br, Cl, I

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Cl, Br, I

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Li, K, Na

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Solution

The correct option is C
Cl, Br, I

Dobereiner grouped three elements together with similar properties. When he arranged these elements in increasing order of their atomic masses, the atomic mass of the middle element was nearly average of the other two elements.

Atomic mass of F = 18.9 amu
Atomic mass of Cl = 35.5 amu
Atomic mass of Br = 79.9 amu
Average atomic mass of F and Br = 49.4
Hence, F, Cl, Br do not follow Doberniers law of Triads.

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