Why group 17 elements are strong non metals while grour 1 elements are strong metals?

Answer 1

Group 17 elements are acceptors of electrons and group 1 elements ar donor of electrons.

Answer 2

Group 17 elements (halogens) are strong non-metals because they have high electronegativity and tend to gain electrons to achieve a stable electron configuration. Group 1 elements (alkali metals) are strong metals because they have low electronegativity and tend to lose electrons to achieve a stable electron configuration.