Write true or false for the statement: It was assumed by Newlands that only $63$ elements existed in nature and no more elements would be discovered in the future.

What were the limitations of Newlands' Law of Octaves?

Elements have been arranged in the following sequence on the basis of their increasing atomic masses.
$F, Na, Mg, Al, Si, P, S, Cl, Ar, K$
$(a)$ Pick two sets of elements which have similar properties.
$(b)$ The given sequence represents which law of classification of elements?

It was found that the law of octaves was applicable only up to:

What were the limitations of Dobereiner's classification?

Up to which element was the Law of Octaves found to be applicable?