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Q.

The number of elements known at that time when Mendeleev arranged them in the periodic table was :

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a

60

b

65

c

63

d

71

answer is A.

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Detailed Solution

The number of elements known at that time when Mendeleev arranged them in the periodic table was 63.

Mendeleev tabulated all 63 elements that had been found up to that point in order of increasing relative atomic masses. There were seven rows and eight columns in the table.

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