How many numbers of elements were known in Mendeleev's time
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Mendeleev arranged all 63 elements which were discovered till his time, in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev's Periodic Table. The table was divided into eight columns and seven rows.
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63 elements
To put some order into his study of chemical elements,Mendeleev made up a set of cards,one for each of the 63 elements known at the time. Mendeleev wrote the atomic weight and the properties of each element on a card.
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