How the position of hydrogen posed a problem in mendleevs periodic table?
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Position of Hydrogen was a big problem in Mendeleév's periodic table--
(i) Hydrogen shows metallic characteristics just like any other metal so, it should be placed in group 1 or 2.
(ii) But, Hydrogen is also dyatomic just like any other hallogen gas.(H2,Cl2,I2,Br2).
This created a problem for Mendeleév and he was unable to answer this.
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