limitation of mandleev periodic table.
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Position of isotopes are not given separate place in periodic table
causes of periodicity mandelvee.dose not explain the periodicity
Position of hydrogen it is uncertain in periodic table bcoz hydrogen is placed in 1 A group
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1. the position of hydrogen: hydrogen is put in the metallic group though it also has characteristics of both halogens and metals.
2. the position of lanthanides and actinides: the lanthanides and actinides are placed in a separate table under the periodic table
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