Question

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Answer 1

Answer:

$\huge\green{\boxed{\tt Hey\:Mate}}$

Newland Octave Rule (1865):-

He arranged the element in the increasing order of their atomic mass and observe that properties of every 8th element was similiar to the 1st one like in the case of musical vowerld notation.

Sa Re Ga Ma Pa Dha Ne Sa

1 2 3 4 5 6 7 8

At that time insert gases were not known .

Example :-

The properties of Li are similar to 8th element i.e. Na , Be are similiar to Mg and so on.

Hope this will help uh!!

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