Question

Explain Mendeleev's Periodic Table. And give its limitations.​

Answer 1

Answer:

Mendeleev's periodic table is an arrangement of elements in an increasing atomic mass order in a tablet form, such that it reflects similarities and trends in the behaviour of elements.

• LIMITATIONS OF Mendeleev's Periodic Table :

1. Position of Hydrogen => Position of hydrogen in the perodic table is Uncertain , Because hydrogen is placed in 1 A group with Alkali metals .
2. Position of isotopes => isotopes haven't been given separate place in perodic table .
3. Cause of periodicity => Mendeleev could not explain the cause of periodicity .
4. Separation of similar elements => some dissimilar elements have been placed together

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Answer 2

Explanation:

Limitations of the Mendeleev periodic table. Elements with large differences in properties were included in the same group. for example, hard metals like copper and silver were included along with soft metals like sodium and potassium. No proper position could be given to the element hydrogen.