chemistry 101 combustion reactions group 1 and 7 elements get more reactive 4 alkali metals and halogens you group 1 and 7 elements get more reactive alkali metals react with hydrogen alkali metals halogens le gases alkali metals definition properties alkali metas vs halogens by morgen alkali metals properties electronic reactions of halogens solved alkali metals react with the alkali metals readily react vigoro alkali metals halogens inert gases