Which of the following is a Dobereiner triad?

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(C) According to Dobereiner's law of triads,the atomic mass of the central element is approximately the arithmetic mean of the atomic masses of the ot

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$Cl, Br, I$

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(C) According to Dobereiner's law of triads,the atomic mass of the central element is approximately the arithmetic mean of the atomic masses of the other two elements in the triad.For the triad $Cl, Br, I$:Atomic mass of $Cl = 35.5$Atomic mass of $I = 127$Arithmetic mean = $\frac{35.5 + 127}{2} = 81.25$This value is close to the actual atomic mass of $Br$ $(80)$.Thus,$Cl, Br, I$ forms a Dobereiner triad.

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