why hydrogen has given unique place in perodic table?

Dear Kushagra,

Hydrogen (H) is separated as it has only 1 electron and so exhibits some unique behavior.
Most elements lose or gain electrons to reach a noble gas configuration. Most they only do one or the other (but not both usually). For instance fluorine (F) will always gain 1 electron to have the electronic configuration of neon (Ne), while lithium (Li) will always lose one electron to have the configuration of helium (He).
Hydrogen is unique in that it can both gain one electron to have the configuration of He, or it can lose one electron and just be a lone proton with no electrons. A half-filled shell (in this case the 1s orbital) is very unstable. It is better to have no electrons or two electrons. Hydrogen can behave either like an alkali metal and be H⁺ (having lost 1 electron) or can act more like a halogen and be H^- (having gained 1 electron).

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