Hydrogen is grouped with the alkali metals because it?

Hydrogen is grouped with alkali metals because it has a single electron in its outer shell or outer energy level. All alkali metals have a single electron in their outer energy level. Although hydrogen is not a metal, but still it is grouped with the alkali metals because of this reason. Still there are numerous differences between the alkali metals and Hydrogen. Hydrogen does not form cations easily, while the alkali metals form cations very easily. Hydrogen is normally found in gaseous form and never in metallic form.