Brief reference on the element includes discussion of the sources of hydrogen, its current uses, and potential for new energy applications.

General and physical information, uses, and key isotopes.

"Contrary to popular belief and portrayal of hydrogen in the Periodic Table of Elementary Particles, single, stand-alone atoms of hydrogen are unstable and do not exist" [PDF]

Electronic, thermal, and steric data along with basic information.

Physical data, chemical properties, health and environmental effects.

The Bohr model for an electron transition in hydrogen between quantized energy levels with different quantum numbers n yields a photon by emission with quantum energy.

Properties of the element, including its history, applications, and charateristics.

Data tables and historic information.