Why is hydrogen said to have dual nature?

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Solution

Hydrogen shows dual nature because it resembles both groups I (alkali metals) and group VIIA (halogens) elements. The reason behind their dual nature is stated below:
Resemblance with the group I (alkali metal) Resemblance with group VIIA (halogens)
Hydrogen has one electron in the valence shell.
So, hydrogen donates one electron to attain inert gas electronic configuration.
Therefore, the hydrogen atom shows electropositive nature which resembles group I of alkali metals.
Hydrogen has one electron in the valence shell.
So, hydrogen can also accept one electron to attain inert gas electronic configuration.
Therefore, hydrogen atoms show electronegative nature which resembles the group VIIA of halogens.

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Resemblance with the group I (alkali metal)	Resemblance with group VIIA (halogens)
Hydrogen has one electron in the valence shell. So, hydrogen donates one electron to attain inert gas electronic configuration. Therefore, the hydrogen atom shows electropositive nature which resembles group I of alkali metals.	Hydrogen has one electron in the valence shell. So, hydrogen can also accept one electron to attain inert gas electronic configuration. Therefore, hydrogen atoms show electronegative nature which resembles the group VIIA of halogens.