Hydrogen

is the with the symbol H and 1.

is the lightest . At standard conditions is a of diatomic molecules having the formula H2.

It is colorless, odorless, non-toxic, and highly combustible.

is the most abundant substance in the universe, constituting roughly 75% of all normal matter.

Stars such as the Sun are mainly composed of in the plasma .

Most of the on exists in molecular forms such as water and compounds.

For the most common isotope of (symbol 1H) each atom has one proton, one electron, and no neutrons.