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? What were the limitations of Newlands' law of octaves?
ChemistryClass 10ICSEAnswered 27 Mar 2026
Answer
- Yes, Dobereiners triads also exist in the columns of Newlands' Octaves. This can be explained by taking the second column of the Newland’s classification of elements,it has the elements Lithium, Sodium and potassium which form a Dobereiner’s triad.
- 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 an also failed to explain the relation between atomic masses of elements and their chemical properties.
- (i) It was not applicable throughout the arrangements
- Those elements discovered after Newland’s octaves did not follow the law of
- The position of cobalt and nickel in the group of elements of different properties could not be explained
- Placing of iron far away from cobalt and nickel, which have similar properties as iron not explained