Hydrogen - Wikipedia
Hydrogen is the most abundant element in the human body by numbers of atoms but the third most abundant by mass. H 2 occurs in human breath due to the metabolic activity of …
Hydrogen | H (Element) - PubChem
Hydrogen has the largest relative mass difference among its isotopes and consequently exhibits the largest variation in isotopic composition of any element that does not have radioactive or …
Hydrogen atom - Wikipedia
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral hydrogen atom contains a nucleus of a single positively charged proton and a single negatively charged …
Hydrogen – Atomic Mass – Atomic Weight – H - Periodic Table …
2020年11月21日 · Atomic mass of Hydrogen is 1.0079 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and …
Hydrogen - Periodic Table and Atomic Properties - Material …
With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, …
Hydrogen - Element information, properties and uses | Periodic …
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 | Properties, Uses, & Facts | Britannica
2024年10月30日 · 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, or 1 H) but also known as …
Hydrogen | H2 | CID 783 - PubChem
Hydrogen is a colorless, odorless gas. It is easily ignited. Once ignited it burns with a pale blue, almost invisible flame. The vapors are lighter than air. It is flammable over a wide range of …
Hydrogen - NIST Chemistry WebBook
Other names: Dihydrogen; o-Hydrogen; p-Hydrogen; Molecular hydrogen; H2; UN 1049; UN 1966 Permanent link for this species. Use this link for bookmarking this species for future reference. …
Atomic Data for Hydrogen (H ) - NIST
As indicated by the energy-level notations in the persistent-lines table, the other wavelengths represent unresolved multiplets. These wavelengths are from the corresponding weighted …