What are the defects in mendellev\'s periodic table

1.	What are the defects in mendellev\'s periodic table
Answer» i) It fails to justify the position of hydrogen in the periodic table.ii) If fails to explain why elements placed in group show similar chemical properties.iii) Mendeleev could not explain the cause of periodicity in the elements.iv) The position for lanthanides and actinides were not included in this table.

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