JKSSB Mock Tests

When Mendeleev started his work, how many elements were known at that time?

A. 56
B. 61
C. 63
D. 72
Answer: Option C
Solution (By JKSSB Mock Tests Team)
When Dmitri Mendeleev formally presented his groundbreaking periodic table to the Russian Chemical Society in exactly 1869, there were only 63 known elements. He boldly left strategic gaps for undiscovered ones, correctly assuming the list was incomplete.
This Question Belongs to: General science Chemistry set 1
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