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 …

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 …

Liquid hydrogen serves as a high-performance rocket propellant with specific impulse values exceeding those of conventional hydrocarbon fuels. Its combustion with oxygen produces exclusively water …

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 …

Jan 21, 2025 · Hydrogen gas (H₂) consists of two hydrogen atoms bonded together. Each hydrogen atom has one proton in its nucleus and one electron. In the hydrogen molecule, the two atoms are …

H2 is a diatomic molecule, meaning it consists of two hydrogen atoms bonded together by a covalent bond. Hydrogen gas is the most abundant element in the universe and is a key component in the …

Elemental hydrogen exists as molecules each of which contains two H atoms. Pure elemental H2 under normal conditions is a colorless, odorless gas that has the lowest density of any pure substance.

Chemical, Physical and Thermal Properties of Hydrogen - H2. Hydrogen, H2, is a colorless, odorless gas. Hydrogen is easily ignited. Once ignited it burns with a pale blue, almost invisible flame. The …

Among atomic forms, it forms various unstable ionized species like a proton (H +), a hydride ion (H −), and a molecular ion (H 2+). The three isotopes of hydrogen gas molecules are represented as H 2 …

Dec 7, 2025 · 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 …