Explain the limitation of Mendeleev’s Periodic table?

1.	Explain the limitation of Mendeleev’s Periodic table?
Answer» 1. Elements with large difference in properties were included in the same group. eg. Hard metal like copper [Cu], Silver [Ag] were included along with soft metals like sodium [Na] potassium [K], 2. No proper position could be given to element hydrogen. Non-metallic hydrogen was placed along with metals like sodium [Na] and potassium [K] 3. The increasing order of atomic mass was not strictly followed throughout. eg. Co and Ni, Te and I 4. As isotopes are atoms of same element having different atomic masses, they should have been given different position while arranging them in the order of atomic mass. But this was not done.

Answer»

1. Elements with large difference in properties were included in the same group.

eg. Hard metal like copper [Cu], Silver [Ag] were included along with soft metals like sodium [Na] potassium [K],

2. No proper position could be given to element hydrogen. Non-metallic hydrogen was placed along with metals like sodium [Na] and potassium [K]

3. The increasing order of atomic mass was not strictly followed throughout.

eg. Co and Ni, Te and I

4. As isotopes are atoms of same element having different atomic masses, they should have been given different position while arranging them in the order of atomic mass. But this was not done.

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