Hydrogen

Hydrogen is the smallest element, with one proton and one electron. It is highly abundant and has unique and important chemical properties.

Hydrides are compounds in which one or more hydrogen anions have nucleophilic, reducing, or basic properties.

Hydrogen has three naturally occurring isotopes: protium, deuterium and tritium. Each isotope has different chemical properties.

Hydrogenation reactions, which involve the addition of hydrogen to substrates, have many important applications.

The hydrogen economy refers to using hydrogen as the next important source of fuel.