Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves?
Question.
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.

solution:
Only one triad of Dobereiner’s triads exists in the columns of Newlands’ octaves. The triad formed by the elements $\mathrm{Li}, \mathrm{Na}$, and $\mathrm{K}$ of Dobereiner’s triads also occurred in the columns of Newlands’ octaves.
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