EXPLAIN THE LIMITATIONS OF NEWLANDS' LAW OF OCTAVES.
Answers
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
→ Law of Octaves only applicable up to calcium and after calcium every 8th did not possess properties similar to that of the first.
→ At the time of Newlands' only 56 elements were existed in nature and Newlands' assume that no more elements will be discovered the future.
→ But, later on , several new elements were discovered, whose properties did not fit into the law of octaves.
→ One important demerit of Newlands' law that he adjusted two elements in the same slot such as Cobalt and nickel [ Co and Ni ] .
→ With the discovery of noble gases the law of octaves become irrelevant.
→ Newlands' law of Octaves worked well with lighter elements only.