Demerits of Mendeleev periodic table
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No proper position of Hydrogen
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1) Hydrogen resembles both the alkali metal and the halogen in properties.It means Mendeleev was unable to decide the real position of Hydrogen in his periodic table.
2) There is no position or place for isotopes.
3)In Mendeleev's periodic table,some elements having similar properties are placed apart like Pt and Au. And some unlike elements are placed together like Na is placed with Cu.
2) There is no position or place for isotopes.
3)In Mendeleev's periodic table,some elements having similar properties are placed apart like Pt and Au. And some unlike elements are placed together like Na is placed with Cu.
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