What is Hydrogen?

Hydrogen is the lightest element in .

It has 1, and the chemical symbol ##"H"##.

It is the most abundant element in the universe.

At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, highly combustible gas.

It is present in almost all organic compounds.

Most of the hydrogen on earth exists in molecules of water (##"H"_2"O"##).