Give three drawbacks of Mendleev's Periodic Table.

1.	Give three drawbacks of Mendleev's Periodic Table.
Answer» Please like the solution 👍 ✔️👍 . Position of hydrogen:-hydrogen resembles both, alkali metals (IA) and the halogens (VIIA) in properties so Mendeleev could not decide where to place it. 2. Position of Isotopes:- As atomic weight of Isotopes differ, they should have been placed in different position in Mendeleev's periodic table. But there was no such places for Isotopes in his table. 3. Cause of periodicity:- Why physical and chemical properties repeated in a group. 4. Anamolous pairs of elements:- There were some pair of elements which did not follow increasing order of atomic weights. Example: Ar&K, Te&I, Co&Ni, Th&Pa

Answer»

Please like the solution 👍 ✔️👍

. Position of hydrogen:-hydrogen resembles both, alkali metals (IA) and the halogens (VIIA) in properties so Mendeleev could not decide where to place it.

2. Position of Isotopes:- As atomic weight of Isotopes differ, they should have been placed in different position in Mendeleev's periodic table. But there was no such places for Isotopes in his table.

3. Cause of periodicity:- Why physical and chemical properties repeated in a group.

4. Anamolous pairs of elements:- There were some pair of elements which did not follow increasing order of atomic weights.

Example: Ar&K, Te&I, Co&Ni, Th&Pa

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