Question

What were the limitations of Mendeleev’s classification of

periodic table?​

Answer 1

(i) He could not assign a correct position of hydrogen in his periodic table, as the properties of hydrogen resembles both with alkali metals as well as with halogens.

(ii) The isotopes of the same element will be given different position if atomic number is taken as basis, which will disturb the symmetry of the periodic table.

(iii) The atomic masses do not increases in a regular manner in going from one elements to the next.So it was not possible to predict how many elements could be discovered between two elements.

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Answer 2

Question:-

What were the limitations of Mendeleev’s classification of  periodic table?​

Answer:-

Limitations of Mendeleev's classification of periodic table:

• Position of Hydrogen ⇒Position of hydrogen in the periodic table is Uncertain , Because hydrogen is placed in 1 A group with Alkali metals
• Position of isotopes ⇒isotopes haven't been given separate place in periodic table
• Cause of periodicity ⇒Mendeleev could not explain the cause of periodicity
• Separation of similar elements ⇒ some dissimilar elements have been placed together
• Position of hydrogen was not justified.
• Increasing order of atomic mass could not be maintained.
• Isotopes were not given separate place as they have different atomic mass.

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