Which of the following set of three elements is not a Dobereiner triad

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$Li, Na, K$

$Cl, Br, I$

$Ca, Sr, Ba$

$S, Se, Te$

answer is D.

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Detailed Solution

According to Dobereiner,

"When three elements are arranged in the increasing order of their atomic weights, the atomic weight of middle element will be the arithmetic mean of atomic weights of the other two elements" .

S,Se,Te is not a dobereiner triad

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