# Question #1847d

Jul 18, 2014

Hydrogen is the lightest element in the periodic table.

#### Explanation:

It has atomic number 1, and the chemical symbol $\text{H}$.

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 ($\text{H"_2"O}$).