Question

1) Discuss the limitations of Mendeleev's periodic table?
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Answer 1

The limitations are:-

#1-Position of hydrogen: Hydrogen is placed in group I.

#2-Anomalous pairs: In certain pairs of elements, the increasing order of atomic masses was not obeyed.

#3-Position of isotopes: Isotopes are the atoms of the same element having different atomic masses but same atomic number.

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Answer 2

Answer:

Question :-

1) Discuss the limitations of Mendeleev's periodic table ?

Answer -

Though Mendeleev was almost successful in arranging the elements on the basis of their properties in his periodic table , the periodic table had some serious drawbacks such as -

1. In some cases , in order to place the elements having similar properties in the same group , Mendeleev placed some elements with higher atomic weight before elements having lower atomic weight .
2. The position of hydrogen in Mendeleev's periodic table was controversial .
3. In some cases , Mendeleev put elements having similar properties in different groups while elements having different properties in the same group .
4. Though the atomic weights of different isotopes are different , they were not given different positions in the periodic table .