Which of the following triads is a Dobereiner's Triad?

Li, Na, K

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N, P, As

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Na, Ra, Al

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S, O, H

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Solution

The correct option is A
Li, Na, K

In the Dobereiner's Triad, three elements are placed as per their increasing atomic masses in which the atomic mass of the middle element is roughly the average of the other two elements.

The atomic mass of Na (23) is the average of the atomic masses of Li (7) and K (39).

The other Triads are:

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