• Helium is the smallest and the lightest noble gas and one of the most unreactive elements, so it was commonly considered that helium compounds cannot exist...
    92 KB (11,102 words) - 18:16, 29 April 2024
  • Thumbnail for Noble gas
    Noble gas (redirect from Helium family (p6))
    gas compounds have been formed. Neutral compounds in which helium and neon are involved in chemical bonds have not been formed (although some helium-containing...
    96 KB (9,857 words) - 06:54, 31 October 2024
  • In chemistry, noble gas compounds are chemical compounds that include an element from the noble gases, group 18 of the periodic table. Although the noble...
    31 KB (3,434 words) - 04:25, 18 October 2024
  • Thumbnail for Helium
    Helium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic...
    146 KB (16,163 words) - 23:03, 22 October 2024
  • can also be viewed as protonated helium. It is the lightest heteronuclear ion, and is believed to be the first compound formed in the Universe after the...
    30 KB (2,989 words) - 07:05, 28 October 2024
  • Thumbnail for Helium dimer
    The helium dimer is a van der Waals molecule with formula He2 consisting of two helium atoms. This chemical is the largest diatomic molecule—a molecule...
    35 KB (4,059 words) - 09:54, 13 October 2024
  • Thumbnail for Krypton
    Krypton (redirect from Krypton compounds)
    Until the 1960s no noble gas compounds had been synthesized. Following the first successful synthesis of xenon compounds in 1962, synthesis of krypton...
    26 KB (3,157 words) - 10:01, 29 October 2024
  • Neon compounds are chemical compounds containing the element neon (Ne) with other molecules or elements from the periodic table. Compounds of the noble...
    34 KB (4,147 words) - 19:23, 12 May 2024
  • Thumbnail for Disodium helide
    Disodium helide (Na2He) is a compound of helium and sodium that is stable at high pressures above 113 gigapascals (1,130,000 bar). It was first predicted...
    6 KB (669 words) - 09:18, 15 June 2024
  • Thumbnail for Liquid helium
    Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures. Liquid helium may show superfluidity. At standard...
    12 KB (1,212 words) - 17:33, 6 June 2024
  • noble gases, where the heavier ones are more reactive); and predicted helium compounds often lack neon analogues even theoretically, but sometimes have beryllium...
    24 KB (2,701 words) - 08:32, 7 March 2024
  • Hydrogen compounds are compounds containing the element hydrogen. In these compounds, hydrogen can form in the +1 and -1 oxidation states. Hydrogen can...
    14 KB (1,492 words) - 18:20, 15 July 2024
  • a curve that oscillates up and down about a dozen times. Helium compounds#Predicted compounds Tariq, Naima; Taisan, Nada; Singh, Vijay; Weinstein, Jonathan...
    4 KB (498 words) - 02:47, 14 October 2024
  • Thumbnail for Helium-3
    Helium-3 (3He see also helion) is a light, stable isotope of helium with two protons and one neutron. (In contrast, the most common isotope, helium-4...
    64 KB (7,231 words) - 04:58, 22 October 2024
  • Thumbnail for Neon
    Neon is a chemically inert gas, with no known uncharged neon compounds. Existing neon compounds are primarily ionic molecules or fragile molecules held together...
    32 KB (3,830 words) - 18:03, 30 October 2024
  • Thumbnail for Helium trimer
    The helium trimer (or trihelium) is a weakly bound molecule consisting of three helium atoms. Van der Waals forces link the atoms together. The combination...
    5 KB (533 words) - 10:50, 3 January 2024
  • Thumbnail for Oxygen compounds
    is −2 in almost all known compounds of oxygen. The oxidation state −1 is found in a few compounds such as peroxides. Compounds containing oxygen in other...
    12 KB (1,468 words) - 02:37, 14 April 2024
  • Thumbnail for Period (periodic table)
    as methane. Hydrogen can form compounds with most elements and is present in water and most organic compounds. Helium (He) exists only as a gas except...
    25 KB (1,836 words) - 22:19, 30 September 2024
  • Thumbnail for Helium atom
    A helium atom is an atom of the chemical element helium. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing...
    35 KB (6,000 words) - 23:07, 25 September 2024
  • of carrier gas. Since most compounds have a thermal conductivity much less than that of the common carrier gases of helium or hydrogen, when an analyte...
    6 KB (878 words) - 16:53, 18 October 2024
  • Thumbnail for Gas giant
    A gas giant is a giant planet composed mainly of hydrogen and helium. Jupiter and Saturn are the gas giants of the Solar System. The term "gas giant" was...
    18 KB (1,909 words) - 02:06, 14 October 2024
  • Thumbnail for Gas chromatography
    chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include...
    38 KB (5,022 words) - 03:26, 19 October 2024
  • Thumbnail for Xenon hexafluoroplatinate
    Xenon hexafluoroplatinate (category Xenon compounds)
    the product was probably a mixture of several compounds, Bartlett's work was the first proof that compounds could be prepared from a noble gas. Since Bartlett's...
    6 KB (534 words) - 10:58, 22 June 2023
  • Helium-3 nuclear magnetic resonance (3He-NMR) is an analytical technique used to identify helium-containing compounds. Because a helium atom, or even...
    2 KB (174 words) - 19:10, 18 July 2023
  • Helium storage and conservation is a process of maintaining supplies of helium and preventing wasteful loss. Helium is commercially produced as a byproduct...
    17 KB (2,451 words) - 00:29, 16 July 2024
  • Thumbnail for Inert gas
    react to form compounds under some conditions. The inert gases are obtained by fractional distillation of air, with the exception of helium which is separated...
    10 KB (1,506 words) - 19:15, 8 October 2024
  • Thumbnail for Lithium
    Lithium (redirect from Lithium compounds)
    alkyl halides. Many other lithium compounds are used as reagents to prepare organic compounds. Some popular compounds include lithium aluminium hydride...
    141 KB (13,748 words) - 12:20, 28 October 2024
  • compounds, the chemical compounds that contain the element argon, are rarely encountered due to the inertness of the argon atom. However, compounds of...
    132 KB (15,778 words) - 19:46, 12 May 2024
  • state (25°C [77°F], 100 kPa) Melting point: helium does not solidify at a pressure of 1 atmosphere. Helium can only solidify at pressures above 25 atm...
    2 KB (439 words) - 14:28, 13 October 2024
  • Thumbnail for Tungsten
    Tungsten (redirect from Tungsten compounds)
    74. It is a rare metal found naturally on Earth almost exclusively as compounds with other elements. It was identified as a distinct element in 1781 and...
    83 KB (9,384 words) - 17:53, 24 October 2024