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what are the defects of menedekeevs periodic table​

Answer 1

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Following are the defects in the Mendeleev periodic table:

Anomalous Pairs. The following pairs of elements don't follow the follow Mendeleev's Principles: ...

Grouping of chemically dissimilar elements. ...

Position of Isotopes. ...

Electronic arrangement. ...

Separation of chemically similar elements. ...

The position of hydrogen.

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Answer 2

The defects of Mendeleev periodic table are:

1. Hydrogen was not given a fixed position
2. Isotopes having same atomic number and different atomic mass number should be given a different places but Mendeleev didn't do that
3. Cobalt and Nickel were given position irrespective of their atomic number as atomic mass were considered
4. It does not explain the electronic arrangement of elements