The discovery of which of the following group of elements gave a death blow to the Newlands law of octaves

Inert gases

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Alkaline earths

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Rare earths

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Actinides

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Solution

The correct option is A
Inert gases

With the discovery of inert gases (group zero in Mendeleev's periodic table) the law of octaves lost its original significance since it was now the $19^{t h}$ element which had properties similar to the 1 one.

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2^{n d}

Which group of elements in the modern periodic table are referred as 'alkaline earth metals'?

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