a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
[ Syn: h , h , atomic number 1 , atomic number 1 ]
a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
[ Syn: h , h , atomic number 1 , atomic number 1 ]