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

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(D) Dobereiner's law of triads states that the atomic mass of the middle element is approximately the arithmetic mean of the atomic masses of the othe

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(D) Dobereiner's law of triads states that the atomic mass of the middle element is approximately the arithmetic mean of the atomic masses of the other two elements in the triad.For the set $(Li, Na, K)$,the atomic masses are $7, 23, 39$. The mean of $Li$ and $K$ is $(7+39)/2 = 23$,which is the atomic mass of $Na$.For the set $(Cl, Br, I)$,the atomic masses are $35.5, 80, 127$. The mean of $Cl$ and $I$ is $(35.5+127)/2 = 81.25$,which is approximately $80$.In the given options,none of the sets represent a valid Dobereiner's triad. Therefore,the correct option is $D$.

Which of the following is a Dobereiner's triad?

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