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What are the defects of Mendeleev's Periodic table?
Defects in Mendeleeff's periodic table

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

2.Position of rare earths 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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