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# 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").