Why hydrogen OUTSIDE place in periodic table?

Answer 1

Sometimes it is placed outside the table, because it does not share any properties with the other elements in their groups, including Group 1.

Answer 2

Hydrogen is placed outside the main group of elements in the Periodic Table because it has properties that are unique compared to other elements in that group. It has properties of both metals and nonmetals and does not fit neatly into any one group based on its characteristics. Additionally, hydrogen has only one electron, which is more similar to the alkali metals in Group 1, but its chemistry and behavior are distinct from them.