What were the limitations of Newlands’ law of octaves ?

(i) It was found that the Law of Octaves was applicable only up to calcium, as after calcium every eighth element did not possess properties similar to that of the first.
(ii)It appears that Newland assumed that only 56 elements existed in nature and no more elements would be discovered in the future. But after discovery of more elements, his Law could no longer hold true and several new elements existed whose properties did not fit into Newlands’ law of Octaves.

(iii)Newland adjusted two elements under the same slot inspite of their different properties. For example: Cobalt and Nickel were put together in just one slot and that too in the column of elements like fluorine, chlorine, and bromine which were very different properties from these elements.

(iv) Iron (Fe) which resembles the elements like cobalt and nickel in properties, was placed far away from these elements