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Newland's Law of Octaves : Assumptions and Limitations

Question

At the time of Newlands, how many elements were known?
$50$
$52$
$54$
$56$

A

56

B

50

C

52

D

54

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Solution

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Newlands law of octaves was given by John Alexander Newland in $1865$ . He arranged the $56$ elements into octaves. He arranged the elements in increasing order of atomic weights and found that every $8 t h$ element shows similar properties with the $1 s t$ element.
Hence, option D is correct.

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