Study of Matter Compounds  Elmhurst College
Atoms Physical Properties Mixtures  Chemistry Department
Elements Chemical Properties    Virtual ChemBook


 Hydrogen, H

Hydrogen has the symbol H.

From the Greek words "hydro" and"genes" meaning "water" and "generator". First isolated by Henry Cavendish in 1766.

Atomic Number = 1, Atomic Mass = 1.006, 1 proton, 1 electron, 0 neutrons.

Most common use:

Commercial fixation of nitrogen from the air in the Haber ammonia process, hydrogenation of fats and oils, methanol production, rocket fuel (in the Space Shuttle's large external tank as a liquid along with liquid oxygen).

Common compounds include, water, ammonia, hydrochloric acid, and present in all organic compounds mostly bonded to carbon.

Physical Properties:

Hydrogen is a gaseous diatomic non-metal that is colorless and very flammable.
Th density of hydrogen is lighter than air which means it will float in air similar to a helium balloon.

The lifting agent for the ill fated Hindenberg balloon was hydrogen rather than the safer helium.

Chemical Properties:

Hydrogen reacts readily with oxygen in a combustion type reaction.

As the ion, hydrogen ion is known for its acid properties.