What quality differentiates hydrogen from other elements in group one

Answer 1

The quality that differentiates hydrogen from other elements in group one of the periodic table is its atomic structure. Hydrogen is the only element in group one and also the only element in the periodic table that does not have a valence electron in the s-orbital of its outermost shell. Instead, it has only one electron and one proton, making it unique and distinct from other members of group one.