Question

comment on a dual position of hydrogen in the periodic table

Answer 1

It occupies a unique position in the periodic table. In its properties, it behaves like alkali metals as well as halogens. In the periodic table, it is placed at the top of the alkali metals. Hydrogen can lose its only electron to form a hydrogen ion (H+) in which case it resembles alkali metals (M) that yield M+ ions.

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Answer 2

hey mate...
here is ur answer..

As hydrogen has a single electron in its shell so there are two possibilities 
1. it can gain one electron to be stable so it can be placed in 1st group
2.it can also lose that electron and can be placed in 17th group of halogens

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