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Revision as of 21:57, 9 May 2019 editGuy Macon (talk | contribs)Extended confirmed users, File movers, New page reviewers, Pending changes reviewers, Rollbackers59,290 edits wikibooks← Previous edit Revision as of 02:33, 2 July 2019 edit undoGuy Macon (talk | contribs)Extended confirmed users, File movers, New page reviewers, Pending changes reviewers, Rollbackers59,290 edits testTag: ReplacedNext edit →
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{{Infobox element
|name=helium
|number=2
|symbol=He
|category=noble gas
|appearance=colorless gas
|isotopes=
|-
! style="text-align:right;" | {{#if: Helium-3 | ] | <sup>3</sup>He }}
| style="{{#ifexpr:{{#invoke:string|find|source=0.0002%|target=%%$|plain=false}}>0|text-align:right}}" | 0.0002%
| colspan="3" style="text-align:center;" | {{#ifeq:yes|yes|]|stable}}<!--


-->
{{ambox|type=content|text='''Some ] ] says that ] with this page. That editor can't be troubled to fix it or even ] it on the article talk page, but we can all sleep easy knowing that they ].'''<br /><small>Please ] this tag to languish indefinitely at the top of this page, since ] it is here.</small>}}
|-
A ''']''' is a place to experiment with editing Misplaced Pages pages. This is Guy Macon's personal sandbox.
! style="text-align:right;" | {{#if: Helium-4 | ] | <sup>4</sup>He }}
| style="{{#ifexpr:{{#invoke:string|find|source=99.9998%|target=%%$|plain=false}}>0|text-align:right}}" | 99.9998%
| colspan="3" style="text-align:center;" | {{#ifeq:no|yes|]|stable}}<!--


-->
''']''' is a sandbox that anyone can use -- see '']'' for details.
|naming=after ], Greek ] of the Sun

|discovered by=], ]
Just some temporary stuff I might need later...
|discovery date=1868

|first isolation by=], ], ]
https://search.creativecommons.org/
|first isolation date=1895

|QID=Q560
https://wikimediafoundation.org/?noredirect=en_US
}}

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’Twas brillig, and the slithy toves did gyre and gimble in the wabe: All mimsy were the borogoves, and the mome raths outgrabe. “Beware the Jabberwock, my son! The jaws that bite, the claws that catch! Beware the Jubjub bird, and shun the frumious Bandersnatch!” He took his vorpal sword in hand; Long time the manxome foe he sought— So rested he by the Tumtum tree and stood awhile in thought. And, as in uffish thought he stood, the Jabberwock, with eyes of flame, Came whiffling through the tulgey wood, and burbled as it came! One, two! One, two! And through and through the vorpal blade went snicker-snack! He left it dead, and with its head he went galumphing back. “And hast thou slain the Jabberwock? Come to my arms, my beamish boy! O frabjous day! Callooh! Callay!” he chortled in his joy. ’Twas brillig, and the slithy toves did gyre and gimble in the wabe: all mimsy were the borogoves, and the mome raths outgrabe.

* https://en.wikibooks.org/Using_Wikibooks
* https://en.wikibooks.org/Wikibooks:What_is_Wikibooks
* https://en.wikibooks.org/Using_Wikibooks/Starting_A_New_Wikibook
* https://en.wikibooks.org/Wikibooks:Reading_room/Assistance#Experienced_Wikipedia_editor_wanting_to_get_started_on_Wikibooks
* https://en.wikiversity.org/Mathematics_software
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{{CC-0 Release}}

Revision as of 02:33, 2 July 2019

Chemical element with atomic number (He)
Helium, 00He
Helium
Pronunciation/ˈhiːliəm/ ​(HEE-lee-əm)
Appearancecolorless gas
Standard atomic weight Ar°(He)
  • 4.002602±0.000002
  • 4.0026±0.0001 (abridged)
Helium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
{{{above}}}
↑
He
↓
{{{below}}}
{{{left}}} ← helium → {{{right}}}
Groupgroup 18 (noble gases)
Periodperiod 1
Block  s-block
Electron configuration1s
Physical properties
Phase at STPgas
Atomic properties
Oxidation statescommon: (none)
0
Color lines in a spectral range
Spectral lines of helium
Other properties
Natural occurrenceprimordial
History
Namingafter Helios, Greek Titan of the Sun
DiscoveryPierre Janssen, Norman Lockyer (1868)
First isolationWilliam Ramsay, Per Teodor Cleve, Abraham Langlet (1895)
Isotopes of helium
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
He 0.0002% stable
He 99.9998% stable
 Category: Helium
| references
  1. "Standard Atomic Weights: Helium". CIAAW. 1983.
  2. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  3. Disodium helide, (Na)2He(e)2, has been synthesized at high pressure, see Dong, Xiao; Oganov, Artem R.; Goncharov, Alexander F.; Stavrou, Elissaios; Lobanov, Sergey; Saleh, Gabriele; Qian, Guang-Rui; Zhu, Qiang; Gatti, Carlo; Deringer, Volker L.; Dronskowski, Richard; Zhou, Xiang-Feng; Prakapenka, Vitali B.; Konôpková, Zuzana; Popov, Ivan A.; Boldyrev, Alexander I.; Wang, Hui-Tian (6 February 2017). "A stable compound of helium and sodium at high pressure". Nature Chemistry. 9 (5): 440–445. arXiv:1309.3827. Bibcode:2017NatCh...9..440D. doi:10.1038/nchem.2716. PMID 28430195. S2CID 20459726.
  4. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.