Dobereiner’s triads also exist in the columns of Newlands classification of elements.

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Detailed Solution

Consider the elements lithium (Li), sodium (Na), and potassium (K) which are present in the second column of Newlands' classification of elements. Now, if we start with lithium as the 1st element, then the 8th element from it is sodium, and according to Newlands' law of octaves, the properties of the 8th element, sodium should be similar to those of the 1st element, lithium. Again, if we take sodium as the 1st element, then the 8th element from it is potassium, and according to Newlands' law of octaves, the properties of the 8th element, potassium should be similar to those of the 1st element, sodium.

This means that according to Newlands' law of octaves, the elements lithium, sodium, and potassium should have similar chemical properties. We also know that lithium, sodium, and potassium form a Dobereiner's triad having similar chemical properties.

From this, we conclude that Dobereiners triads also exist in the columns of Newlands Octaves.

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