Question

what are the drawbacks of Medeleevs periodic table?​

Answer 1

Answer:

Explanation:1. He doesn't tell the isotope of elements like:Cl-35 and Cl-37

Answer 2

Answer:

Some drawbacks in mendeleev's periodic table are:

1.Anomalous pairs of elements- Certain pairs of elements having higher atomic weights have been given positions before the elements having lower atomic weights.

This defect disappears if elements were arranged according to their atomic numbers.

eg.Co[at.wt. 58.9, at. no.27] was placed before Ni[at. wt. 58.6, at. no. 28].

2.Position of rare earth and actinides- Could be justified only if arranged according to their atomic numbers.

3.Position of isotopes- Isotopes had to be placed in same position according to atomic numbers.

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