How many elements were known when Mendeleev gave his periodic table?

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Solution

Mendeleev's periodic table
Dmitri Mendeleev introduced a periodic arrangement of elements in which they are arranged in the order of their relative atomic masses. The elements with same properties were arranged below each other in the same group and he also left gaps in the periodic table for elements yet-to-be- discovered. He als successfully predicted the properties of undiscovered elements based on its group.
Mendeleev's periodic table was proposed in 1869. The number of elements discovered during its introduction was 63. Therefore, Mendeleev's periodic table contained 63 discovered elements.

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