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Question

In Dobereiner's classification system, the atomic mass of the middle element could be estimated by
A. finding the difference between the atomic masses of the other two elements in a triad
B. finding the product of the atomic masses of the other two elements in a triad
C. averaging the atomic masses of the heaviest and lightest elements in a triad
D. adding the atomic masses of the other two elements in a triad

Answer

Dobereiner's classification system is more commonly known as Dobereiner's Triads. From the name itself, Dobereiner grouped elements into groups of three that have similar properties. According to this system, the atomic weight of the middle element is more or less the average of the atomic weights of the other two elements. So, the answer is C.
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