Which of the following is a Dobereiner's tria | vedclass

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(C) Dobereiner's law of triads states that in a triad of three elements arranged in increasing order of atomic masses,the atomic mass of the middle el

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$Cl, Br, I$

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(C) Dobereiner's law of triads states that in a triad of three elements arranged in increasing order of atomic masses,the atomic mass of the middle element is approximately the arithmetic mean of the atomic masses of the other two elements.For the triad $Cl, Br, I$:Atomic mass of $Cl = 35.5$Atomic mass of $I = 127$Mean mass $= (35.5 + 127) / 2 = 162.5 / 2 = 81.25$The atomic mass of $Br$ is $80$,which is very close to $81.25$. Hence,$Cl, Br, I$ forms a Dobereiner's triad.

Which of the following is a Dobereiner's triad?

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