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.

Dec 7, 2025 · Hydrogen has three known isotopes. The mass numbers of hydrogen’s isotopes are 1, 2, and 3, the most abundant being the mass 1 isotope generally called hydrogen (symbol H, …

Hydrogen is the lightest element. Hydrogen is a gas at normal temperature and pressure, but hydrogen condenses to a liquid at minus 423 o F (-253 o C).

Element Hydrogen (H), Group 1, Atomic Number 1, s-block, Mass 1.008. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Hydrogen was first recognized as a distinct element by Henry Cavendish in 1766. Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in …

Hydrogen atoms have 1 electrons and the shell structure is 1. The ground state electronic configuration of neutral hydrogen is 1s1 and the term symbol of hydrogen is 2S1/2.

Jan 6, 2026 · Elemental Hydrogen At room temperature and pressure, elemental hydrogen exists in the form of dihydrogen, H 2. Dihydrogen is a colorless, odorless gas that finds wide …

May 4, 2025 · What is Hydrogen? Learn everything about the lightest & most abundant element in the universe, its properties, uses, & potential to shape the world.

Jan 21, 2025 · 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, including the Sun, mainly consist of hydrogen in a plasma state, while on Earth, hydrogen is found as the gas H2 (dihydrogen) and in molecules, such as in water and organic compounds. …