write Newlands’ Law of Octaves limitation
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Answer:
The major limitations of Newlands' law of octaves were : (i) It was applicable to only lighter elements having atomic masses upto 40 u, i.e., upto calcium. After calcium, the first and the eighth element did not have similar properties.
→ 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.