Question

in periodic table of Mendeleev arrangement of elements was done in________
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Answer 1

Answer:

periods and groups

on the basis of atomic size ✌✌✌❣️❣️❣️

Answer 2

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In 1869, just five years after John Newlands put forward his Law of Octaves, a Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.

Hope you understand ☺️