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Hydrogen - Wikipedia
Hydrogen is a chemical element; it has the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter.

Hydrogen | Properties, Uses, & Facts | Britannica
The earliest known chemical property of hydrogen is that it burns with oxygen to form water; indeed, the name hydrogen is derived from Greek words meaning ‘maker of water.’

Global Hydrogen Review 2025
Abstract The Global Hydrogen Review is an annual publication by the International Energy Agency that tracks hydrogen production and demand worldwide, shedding light on the latest developments on policy, infrastructure, trade, investments and innovation.

Hydrogen - Department of Energy
Hydrogen has been described as the “Swiss army knife” of energy because it plays a key role in several sectors where there are limited or no viable alternatives (including in applications where electrification is particularly challenging or costly).

Hydrogen - Element information, properties and uses | Periodic Table
Hydrogen is easily the most abundant element in the universe. It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen.

Hydrogen explained - U.S. Energy Information Administration (EIA)
Hydrogen occurs naturally on earth in compound form with other elements in liquids, gases, or solids. Hydrogen combined with oxygen is water (H 2 O). Hydrogen combined with carbon forms different compounds—or hydrocarbons—that are found in natural gas, coal, and petroleum.

Isotopes of hydrogen - Wikipedia
Hydrogen (1 H) has three naturally occurring isotopes: 1 H, 2 H, and 3 H. 1 H and 2 H are stable, while 3 H has a half-life of 12.32 years. [4][nb 1] Heavier isotopes also exist; all are synthetic and have a half-life of less than 1 zeptosecond (10 −21 s). [5][6] Hydrogen is the only element whose isotopes have different names that remain in common use today: 2 H is deuterium [7] and 3 H is ...

Hydrogen - Simple English Wikipedia, the free encyclopedia
Hydrogen is the lightest and most abundant element in the universe. It is the simplest element and the first in the periodic table. It has the chemical symbol H and atomic number 1, which means it has just one proton in its nucleus. Hydrogen also has a standard atomic weight of 1.008.

Why haven't hydrogen-powered cars caught on? - USA TODAY
Toyota, Hyundai, Honda and others continue to pump money into hydrogen fuel cell vehicles despite significant drawbacks and uncertain viability.

Hydrogen (H) - Definition, Preparation, Properties, Uses, Compounds ...
What is Hydrogen? Hydrogen is the simplest and most abundant element in the universe, consisting of just one proton and one electron. This lightweight, colorless gas is found in great abundance in stars and gas giants and is a fundamental building block in the chemistry of life.