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(a) Did Dobereiner’s triads also exist in the columns of Newlands’ law of octaves? Explain your answer.
(b) What were the limitations of Dobereiner’s classification of elements?
(c) What were the limitations of Newlands’ law of octaves?
(a) Yes, Dobereiners triads also exist in the columns of Newlands’ Octaves.
For example, on considering the second column of the Newland’s classification of elements, it has the elements lithium (Li), sodium (Na), and potassium(K) that also form a Dobereiner’s triad.
(b) The main limitation of Dobereiner’s classification of elements was that
- It failed to arrange all the then-known elements in the form of triads of elements having similar chemical properties.
- It also failed to explain the relation between atomic masses of elements and their chemical properties.
(c) The limitations of Newlands’ law of octaves are given below:
- It was not applicable throughout the arrangements. It was only applicable up to calcium. After calcium, every eighth element did not possess properties similar to that of the first element. Thus, this law worked well with lighter elements only.
- Newlands assumed that only 56 elements existed in nature and no more elements would be discovered in the future. Those elements discovered after Newland’s octaves did not follow the law of octaves.
- The position of cobalt and nickel in the group of elements of different properties could not be explained.
- The placing of iron far away from cobalt and nickel, which have similar properties as iron not explained.
Updated on: 10-Oct-2022
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