Question

write one demerit for Newlands law of octaves.​

Answer 1

Newland could arrange elements only up to calcium, out of the total 56 elements known. After calcium, every eighth element did not possess properties similar to that of the first. ... For example Iron, an element which resembles cobalt and nickel in its properties is placed far away from these elements.

Answer 2

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Newland's law of octaves held true only for elements up to calcium. Elements with greater atomic masses could not be accommodated into octaves. The elements that were discovered later could not be fit into the octave pattern.

(i) This classification worked well for lighter elements only up to Ca. (ii) This classification gave us a relation between the properties of the elements and their atomic masses. (iii) It was shown by this classification for the first time that there exists a periodicity in the properties of the elements.