Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply hydrogen. Dihydrogen is …

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Apr 14, 2026 · One molecule of hydrogen dissociates into two atoms (H 2 → 2H) when an energy equal to or greater than the dissociation energy (i.e., the amount of energy required to break the bond that …

Apr 18, 2025 · Hydrogen (H 2), a diatomic molecule consisting of two hydrogen atoms covalently bonded, holds a position of paramount importance in chemistry, physics, and increasingly, in …

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Jan 21, 2025 · We write H2 instead of H because hydrogen naturally exists as a diatomic molecule, meaning two hydrogen atoms bond together to form H2, the most stable form of hydrogen gas.

Liquid hydrogen (H₂ (l)) represents the cryogenic liquid state of molecular hydrogen, existing below its critical temperature of 33.0 K. This cryogenic fluid exhibits a boiling point of 20.28 K at standard …

This page discusses hydrogen (H), the first element, primarily as the diatomic molecule (H2), a colorless, odorless gas used in industries like ammonia and methanol production.

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of …