The atomic weight of element is and that of element is . If , , and form a Dobereiner's triad, what — Periodic Table and Periodicity Chemistry Question
Question
The atomic weight of element $X$ is $35.5$ and that of element $Z$ is $127$. If $X$, $Y$, and $Z$ form a Dobereiner's triad, what is the predicted atomic weight of the intermediate element $Y$?
Answer: B
💡 Solution & Explanation
According to Dobereiner's Law of Triads, the atomic weight of the middle element is approximately the arithmetic mean of the atomic weights of the first and third elements. Atomic weight of $Y = \frac{35.5 + 127}{2} = \frac{162.5}{2} = 81.25$. This corresponds to the $Cl, Br, I$ triad.
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