Is it true that Dobereiner's triads also existed in Newlands’ octave?

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Detailed Solution

The above statement is true.
The columns of Newlands' octaves contain Dobereiner's triads as well.
The arithmetic mean of the atomic masses of the first and third elements in a triad, according to Dobereiner's law of triads, would be about equal to the atomic mass of the second element in that triad. Dobereiner's triads also existed in Newland’s octave. For instance, lithium (Li), sodium (Na) and potassium (K) are present in the second column of Newlands’ octaves and also form a triad.

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