How many elements are present in Newlands periodic table?

Sixty

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Fifty seven

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Fifty eight

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Fifty six

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Solution

The correct option is D Fifty six
According to Newland law of octaves when elements are arranged in an increasing order of atomic mass, every eighth element had the properties similar to that of the first element.
He started with the element hydrogen and ended at thorium which was 56 $^{t h}$ element.
Elements given by Newland's are :

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