Question

At scientist newlands time how many elements were known
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Answer 1

Answer:

62 known elements

In the year of 1864, English chemist John Newlands grouped 62 known elements at that time into 8 groups according to their properties. Hence it's classification is also known as the Law of Octaves (octa:8). But this was not effective for all the elements discovered at that time as all the elements weren't discovered

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Answer 2

Answer:

42 it's the correct answer

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