hydrogen
- hydrogensearch for term
An element, usually in the form of a gas, whose nucleus is made of one proton. Hydrogen is the most abundant element in the universe, accounting for about 75% of the composition of the universe.
An element, usually in the form of a gas, whose nucleus is made of one proton. Hydrogen is the most abundant element in the universe, accounting for about 75% of the composition of the universe.