Question

looking at its resemblance to alkali metals and thr halogen family, try to asign hydrogen a correct position in Mendeleevs periodic table​

Answer 1

Mendeleev considered formulae of hydrides and oxides formed by an element as one of the basic properties to classify the elements in his Periodic Table.

Hydrogen makes oxides similar to alkali metals, such as H2O (Hydrogen oxide i.e. water) and hydrides similar to halogen such as LiH (Lithium hydride), so it could be placed with halogens in the same group i.e. in VIIth group. But, hydrogen was placed with alkali metals in Ist group in Mendeleev's Periodic Table.

It appears that hydrogen is placed as starting element in 1st period and Ist group in the Mendeleev's Periodic Table. Thus, I think it was the correct position as hydrogen has been placed the same position even in Modern Periodic table.

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