Question

Mendellev periodic law has failed

Answer 1

because of some new conceps were arise thats why he failed to explain

Answer 2

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the demerits of Mendeleev periodic table are

1) Anomalous pairs
2) position of isotopes
3) grouping of chemically dissimilar elements
4) separation of chemically similar element
5) electron arrangement
6) position of hydrogen

Definition is in photo

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