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Q.

The number of elements known at the time of Mendeleev was:


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a

43

b

53

c

63

d

73 

answer is C.

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Detailed Solution

63 elements were known at the time of Mendeleev.
Mendeleev stated that "Element properties are a periodic function of their atomic mass" in his famous periodic law. Mendeleev's periodic table has 9 groups as well as 7 periods. The horizontal rows are known as periods whereas the vertical columns are called groups. In Mendeleev’s time, 63 elements were discovered.   
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The number of elements known at the time of Mendeleev was: