Témbongkeun sumber pikeun Hélium

[[Gambar:HeNe Laser Build.webm|jmpl|Laser hélium]]
'''Hélium''' (He) mangrupa [[unsur kimia]] monoatomik inert nu teu warnaan, tanpa bau, tanpa rasa, non-toksik nu 'mingpin' [[gas mulya]] dina [[tabel periodik]] nu [[nomer atom]]na 2. [[Titik golak]] jeung [[titik lééh|lééhna]] panghandapna ti sakur unsur sarta ngan aya dina bentuk [[gas]], iwal dina kaayaan nu teu biasa. Kaayaan luar biasa ieu ogé perlu pikeun nyieun [[sanyawa kimia|sanyawaan]] hélium anu teu stabil dina [[suhu jeung tekenan baku]]. [[Isotop]]na anu stabil nyaéta [[hélium-3]].

Hélium téh unsur kadua anu paling [[kalimpahan kimia|ngaleuyah]] sarta kadua panghampangna di [[mayapada]]. Ieu unsur ogé kaasup salah sahiji anu dihasilkeun tina ''[[Big Bang]]''. Kiwari, ampir sakabéh hélium anyar dihasilkeun tina [[fusi nuklir]] [[hidrogén]] di [[béntang]]. Di [[Marcapada]], ieu unsur dihasilkeun tina [[udaran radioaktif]] unsur-unsur nu leuwih beurat([[partikel alfa]] téh inti hélium).

Taun [[1868]], ahli [[astronomi]] [[Prancis]] [[Pierre Janssen]] [[papanggihan unsur kimia|manggih]] hélium salaku hiji [[spéktroskopi|gurat spéktral]] dina cahya [[samagaha panonpoé]]. Kadieunakeun hélium loba kapanggih di [[tambang gas alam]] di [[Amérika Serikat|AS]].

== Rujukan ==
* ''[[:en:Helium|Helium]]'', Wikipédia édisi basa Inggris. Disalin 1 Agustus 2007.

== Tumbu kaluar ==
{{Commons|Helium}}
;Vidéo Hélium Cair
* [http://www.youtube.com/watch?v=fg1huRoaJdU&mode=related&search= Liquid Helium Video]

;Umum
* [http://www.blm.gov/wo/st/en/info/newsroom/2007/january/NR0701_2.html US Government' Bureau of Land Management: Sources, Refinement, and Shortage] {{Webarchive|url=https://web.archive.org/web/20080725060842/http://www.blm.gov/wo/st/en/info/newsroom/2007/january/NR0701_2.html |date=2008-07-25 }}
* [http://www.webelements.com/webelements/elements/text/He/key.html WebElements: Helium]
* [http://education.jlab.org/itselemental/ele002.html It's Elemental – Helium]
* [http://theodoregray.com/PeriodicTable/Elements/002/ Photos and applications of Helium]
* [http://www.fluidmech.net/msc/super/super-f.htm Fluidmech.net] {{Webarchive|url=https://web.archive.org/web/20070405010647/http://www.fluidmech.net/msc/super/super-f.htm |date=2007-04-05 }} ngeunaan hélium II cair jeung diagram faseu tiis

;Leuwih teleb
* [http://boojum.hut.fi/research/theory/helium.html Helium] ti [[Universitas Téhnologi Helsinki]]
* [http://www.lancs.ac.uk/depts/physics/research/condmatt/ult/index.html Lancaster University, Ultra Low Temperature Physics]

;Unak-anik
* [http://www.fluidmech.net/msc/super/super-f.htm Phase diagram of helium, showing lambda line] {{Webarchive|url=https://web.archive.org/web/20070405010647/http://www.fluidmech.net/msc/super/super-f.htm |date=2007-04-05 }}
* [http://www.phys.unsw.edu.au/PHYSICS_!/SPEECH_HELIUM/speech.html Physics in Speech] kalawan conto audio nu mintonkeun ''pitch'' sora anu teu robah
* [http://www.du.edu/~jcalvert/phys/helium.htm Artikel ngeunaan hélium jeung gas mulya lianna]
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[[Kategori:Unsur kimia]]
[[Kategori:Gas mulya]]
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