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Question 1
Did Dobereiner's triads also exist in the columns of Newlands' octaves? Compare and find out.

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Solution

Yes, Dobereiner's triads also existed in the columns of Newlands' octaves.

According to Newland’s law of octaves, every eighth element had properties similar to that of the first.

For example, the elements lithium (Li), sodium (Na), and potassium (K) are present in the second column of Newlands' classification of elements. If we consider lithium as the first element, the 8th element from it will be sodium.

Again, considering sodium as the 1st element, the 8th element from it is potassium.

This means that according to Newland’s law of octaves, lithium, sodium, and potassium should have similar properties. We also know that lithium, sodium, and potassium form a Dobereiner's triad having similar chemical properties. This shows that Dobereiner's triads also exist in the columns of Newlands' octaves.


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