Question : When did Dmitri Mendeleev invent the periodic table, ordering the symbols of the chemical elements according to their atomic weights?
Option 1: 1794
Option 2: 1869
Option 3: 1890
Option 4: 1779
Correct Answer: 1869
Solution : The correct answer is 1869.
Dmitri Mendeleev was a Russian chemist and inventor. In 1869, he created the foundation for the modern periodic table, left gaps for the elements that were yet to be discovered and arranged the elements according to their atomic weight.
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