Hydrogen gas (H₂)

Definition

Hydrogen gas is a diatomic molecule made up of two hydrogen atoms bonded together. It is a colorless, odorless gas and is the lightest element on the periodic table.

Related terms

Diatomic molecule: A molecule consisting of two atoms chemically bonded together, such as H₂ or Cl₂.

Combustion:

A chemical reaction between a fuel and oxygen that produces heat and usually light.

Electronegativity:

The tendency of an atom to attract electrons towards itself in a chemical bond.