Question

At ghe time of mandeleev ghe no of elements known as​

Answer 1

Answer:

63 elements

Explanation:

when mendeleev start classification theracare only 63 elements are known

Answer 2

At the time of mandeleev the no of elements known as 63

Explanation:- 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. He took the cards everywhere he went.

____