Question : The number of elements known at the time of Russian chemist Dmitri Ivanovich Mendeleev was:
Option 1: 57
Option 2: 53
Option 3: 63
Option 4: 67
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Correct Answer: 63
Solution : The correct answer is 63.
The Russian chemist Mendeleev made the greatest contribution to the creation of the periodic table, which arranged the elements according to similar chemical properties as well as their atomic mass, a fundamental property. At the time, only 63 elements were known.
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