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Merits of Mendeleev's Periodic Table

Hydrogen is p...

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Hydrogen is placed above the alkali metals in both Modern periodic table and Mendeleev's periodic table, but why it is considered as a demerit only in Mendeleev's periodic table and not in Modern periodic table?

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Q. Which group elements of modern periodic table were placed along with alkali metals in Mendeleev table?

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Merits of Mendeleev's Periodic Table

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