Hydrogen is the lightest element and the principal fuel of stars, where fusion releases enormous amounts of energy.
Atomic number
1
Category
Reactive nonmetal
Period
1
Group
1
State
Gas
Fun facts about Hydrogen
A neutral atom has one proton and one electron.
Most terrestrial hydrogen is bound in water or organic compounds.
Its common isotope protium contains no neutron.
Common uses of Hydrogen
Ammonia production
Fuel cells and rocket propellant
Hydrogenation of oils
Where Hydrogen sits in the periodic table
Hydrogen is classified as a reactive nonmetal in period 1 and group 1 of the periodic table. Under the conditions represented in this reference, its state is gas.
Quick chemistry revision
For quick revision, pair the symbol H with atomic number 1 and the listed atomic mass 1.008. The summary, facts, and uses above keep those element properties together in one reference.