Question

what were the limitations of Newlands Law of Octaves​

Answer 1

Answer:

(1) Newland's law of octaves i.e, applicable to only the first few elements' i.e, only up to calcuium out of total 56 elements known at that time.

(2) Newlands placed two elements each in some boxes to accommodate all know elements e.g, Co and Ni, Ce and La. He placed some elements with different propterties under the same note in the octave. For exmaple , Co and Ni under the note Do along with halogens, while Fe having similarity with Co and Ni away from them along with halogens, while Fe having similarity with Co and Ni away from them along with the nonmetals O and S under the note Ti.

(3) Newlands' octaves did not have provision to accommodate the newly discovered elements.

Answer 2

→ 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.