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Chemistry · Classification of Elements and Periodicity in Properties
हिन्दीIn Johann Dobereiner's triads, if the atomic weights of the first and third elements are \( 7 \) and \( 39 \) respectively, what is the predicted atomic weight of the middle element?
Correct answer · Option 1
23
Explanation
According to Dobereiner's Law of Triads, the atomic weight of the middle element is approximately the arithmetic mean of the other two: \( (7 + 39) / 2 = 23 \).
