Laursen, S.; Chang, J.; Medlin, W.; Gürmen, N.; Fogler, H. S. (27 July 2004). "An extremely brief introduction to computational quantum chemistry". Molecular Modeling in Chemical Engineering. University of Michigan. Archived from the original on 20 May 2015 . Retrieved 4 May 2015. Perdoncin, G.; Scorrano, G. (1977). "Protonation Equilibria in Water at Several Temperatures of Alcohols, Ethers, Acetone, Dimethyl Sulfide, and Dimethyl Sulfoxide". Journal of the American Chemical Society. 99 (21): 6983–6986. doi: 10.1021/ja00463a035. The ground state energy level of the electron in a hydrogen atom is −13.6 eV, [25] which is equivalent to an ultraviolet photon of roughly 91 nm wavelength. [26] Chemistry Operations (15 December 2003). "Hydrogen". Los Alamos National Laboratory. Archived from the original on 4 March 2011 . Retrieved 5 February 2008.

Presenter: Professor Jim Al-Khalili (21 January 2010). "Discovering the Elements". Chemistry: A Volatile History. 25:40 minutes in. BBC. BBC Four. Archived from the original on 25 January 2010 . Retrieved 9 February 2010. Hydrogen". Encyclopædia Britannica. Archived from the original on 24 December 2021 . Retrieved 25 December 2021. a b Brown, W. J.; etal. (1997). "Safety Standard for Hydrogen and Hydrogen Systems" (PDF). NASA. NSS 1740.16. Archived (PDF) from the original on 1 May 2017 . Retrieved 12 July 2017. H 2 is produced by hydrogenase enzymes in some fermentation. [120] Applications Petrochemical industry

Shielding gas: Hydrogen is used as a shielding gas in welding methods such as atomic hydrogen welding. [142] [143] Proposed in 1908 as part of the new Latvian spelling by the scientific commission headed by K. Mīlenbahs, which was accepted and began to be taught in schools in 1909. Prior to that, Latvian had been written in German Fraktur, and sporadically in Cyrillic. Incropera 1 Dewitt 2 Bergman 3 Lavigne 4, Frank P. 1 David P. 2 Theodore L. 3 Adrienne S. 4 (2007). Fundamentals of heat and mass transfer (6thed.). Hoboken, NJ: John Wiley and Sons, Inc. pp.941–950. ISBN 978-0-471-45728-2. OCLC 62532755. {{ cite book}}: CS1 maint: numeric names: authors list ( link) H) are sometimes used for deuterium and tritium, but the symbol P is already in use for phosphorus and thus is not available for protium. [65] In its nomenclatural guidelines, the International Union of Pure and Applied Chemistry (IUPAC) allows any of D, T, 2

Table of thermal and physical properties of hydrogen (H 2) at atmospheric pressure: [71] [72] Temperature (K) Unique among the elements, distinct names are assigned to its isotopes in common use today. During the early study of radioactivity, various heavy radioactive isotopes were given their own names, but such names are no longer used, except for deuterium and tritium. The symbols D and T (instead of 2 Lees, A. (2007). "Chemicals from salt". BBC. Archived from the original on 26 October 2007 . Retrieved 11 March 2008. In the absence of acid, the evolution of H 2 is slower. Because iron is widely used structural material, its anaerobic corrosion is of technological significance: Press, Roman J.; Santhanam, K. S. V.; Miri, Massoud J.; Bailey, Alla V.; Takacs, Gerald A. (2008). Introduction to Hydrogen Technology. John Wiley & Sons. p.249. ISBN 978-0-471-77985-8.H is known as tritium and contains one proton and two neutrons in its nucleus. It is radioactive, decaying into helium-3 through beta decay with a half-life of 12.32 years. [50] It is radioactive enough to be used in luminous paint to enhance the visibility of data displays, such as for painting the hands and dial-markers of watches. The watch glass prevents the small amount of radiation involved from escaping the case. [59] Small amounts of tritium are produced naturally by the interaction of cosmic rays with atmospheric gases; tritium has also been released during nuclear weapons tests. [60] It is used in nuclear fusion reactions, [61] as a tracer in isotope geochemistry, [62] and in specialized self-powered lighting devices. [63] Tritium has also been used in chemical and biological labeling experiments as a radiolabel. [64] Used to indicate the hour in a time indication, either with or without following minutes. 10 h ― 10:00 a.m. 20 h30 ― 8:30 p.m. Boyd, Padi (19 July 2014). "What is the chemical composition of stars?". NASA. Archived from the original on 15 January 2015 . Retrieved 5 February 2008.

Gurov, Y. B.; Aleshkin, D. V.; Behr, M. N.; Lapushkin, S. V.; Morokhov, P. V.; Pechkurov, V. A.; Poroshin, N. O.; Sandukovsky, V. G.; Tel'kushev, M. V.; Chernyshev, B. A.; Tschurenkova, T. D. (2004). "Spectroscopy of superheavy hydrogen isotopes in stopped-pion absorption by nuclei". Physics of Atomic Nuclei. 68 (3): 491–97. Bibcode: 2005PAN....68..491G. doi: 10.1134/1.1891200. S2CID 122902571. music ) Alternative form of H ( “ B ”, the seventh note in the C major scale, its symbol in writing or in print, or the equivalent key of a piano or stop of a stringed instrument )

Phoenician and proto-Semitic languages are the earliest recorded alphabets that use symbols to represent sounds rather than to represent things like Egyptian hieroglyphics. (Greek is considered the first true alphabet because it uses symbols to represent both consonant and vowel sounds). In proto-Semitic, the letter H was also the word for thread or fence, and if you look at the letter H, it is still clear that it looks like a portion of a fence. Crepeau, R. (1 January 2006). Niels Bohr: The Atomic Model. ISBN 978-1-4298-0723-4. {{ cite book}}: |journal= ignored ( help) Okumura, A. M.; Yeh, L. I.; Myers, J. D.; Lee, Y. T. (1990). "Infrared spectra of the solvated hydronium ion: vibrational predissociation spectroscopy of mass-selected H 3O+•(H 2O )n•(H 2) m". Journal of Physical Chemistry. 94 (9): 3416–3427. doi: 10.1021/j100372a014. Lavoisier produced hydrogen for his experiments on mass conservation by reacting a flux of steam with metallic iron through an incandescent iron tube heated in a fire. Anaerobic oxidation of iron by the protons of water at high temperature can be schematically represented by the set of following reactions:

a b Rogers, H. C. (1999). "Hydrogen Embrittlement of Metals". Science. 159 (3819): 1057–1064. Bibcode: 1968Sci...159.1057R. doi: 10.1126/science.159.3819.1057. PMID 17775040. S2CID 19429952. Dincer, Ibrahim; Acar, Canan (14 September 2015). "Review and evaluation of hydrogen production methods for better sustainability". International Journal of Hydrogen Energy. 40 (34): 11094–11111. doi: 10.1016/j.ijhydene.2014.12.035. ISSN 0360-3199. Archived from the original on 15 February 2022 . Retrieved 4 February 2022. Report from the Commission on Dietary Food Additive Intake" (PDF). European Union. Archived (PDF) from the original on 16 February 2008 . Retrieved 5 February 2008. photon wavelength 13.6 eV". Wolfram Alpha. 20 May 2015. Archived from the original on 12 May 2016 . Retrieved 20 May 2015.Hardy, W. N. (2003). "From H2 to cryogenic H masers to HiTc superconductors: An unlikely but rewarding path". Physica C: Superconductivity. 388–389: 1–6. Bibcode: 2003PhyC..388....1H. doi: 10.1016/S0921-4534(02)02591-1. Latin-script letters ) täht; A a, B b ( C c), D d, E e, F f, G g, H h, I i, J j, K k, L l, M m, N n, O o, P p ( Q q), R r, S s, Š š, Z z, Ž ž, T t, U u, V v ( W w), Õ õ, Ä ä, Ö ö, Ü ü ( X x, Y y) Buoyant lifting: Because H 2 is lighter than air, having only 7% of the density of air, it was once widely used as a lifting gas in balloons and airships. [145] Berman, R.; Cooke, A. H.; Hill, R. W. (1956). "Cryogenics". Annual Review of Physical Chemistry. 7: 1–20. Bibcode: 1956ARPC....7....1B. doi: 10.1146/annurev.pc.07.100156.000245.