Question

Limitation of new land law of ob tent

Answer 1

limitations of newlands law of octaves qre: 
1) Newlands assumed that only 56 elements existed in nature and no more elements would be further discovered in the nearer future. But later on several new elements were discovered, whose properties couldn’t be defined as per the Law of Octaves.
2)In order to fit elements into law of octaves Newlands not only adjusted two elementsin the same slot but also adjusted some unlike elements under the same note.
3)Cobalt and nickel are in the same slot and are positioned in the same column with fluorine, chlorine and bromine possessing different properties than these elements.
4)Iron possessing similar properties as cobalt and nickel, is placed far away from these elements.
5) Thus, Newlands’ Law of Octaves can be obeyed well by the lighter elements only.

Answer 2

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.Only 56 elements were known at the time of Newlands, but later several elements were discovered.In order to fit the existing element arrangement, Newlands placed two elements in the same position which differed in their properties.For example Iron, an element which resembles cobalt and nickel in its properties is placed far away from these elements.The periodic table did not include inert gases because they were not discovered then.

these are the limitations.hope it helps