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What were the limitations of Newlands' l...

What were the limitations of Newlands' law of Octaves ?

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(i) The law was applicable to elements upto calcium (Ca) only.
(ii) It contained only 56 elements. Further it was assumed by Newlands that only 56 elements existed in nature and no more elements would be discovered in the future.
(iii) In order to fit elements into the table, Newland adjusted two elements in the same column as fluorine, chlorine and bromine which have very different properties than these elements. Iron, which resemble cobalt and nickel in properties, has been placed differently away from these elements.
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