1. Tardigrade
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  3. Chemistry
  4. Cl, Br, I, if this is Dobereiner’s triad and the atomic masses of Cl and I are 35.5 and 127 respectively the atomic mass of Bris

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Q. $Cl, Br, I,$ if this is Dobereiner’s triad and the atomic masses of $Cl $ and $I$ are $35.5$ and $127$ respectively the atomic mass of Bris

Classification of Elements and Periodicity in Properties

Solution:

According to Dobereneir's triad the atomic mass of $Br$ will be average of the atomic masses of $Cl$ & $I$
$=\frac{35.5+127}{2}=81.25$