Hydrogen: Ìyàtọ̀ láàrin àwọn àtúnyẹ̀wò
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Ìlà 11:
|year=1989
|isbn=0-19-861219-2
}}</ref> {{respell|HYE|dro-jin}}) is the [[chemical element]] with [[atomic number]] 1. It is represented by the [[chemical symbol|symbol]] '''H'''. With an [[atomic weight]] of {{val|1.00794|u=[[atomic mass unit|u]]}} ({{val|1.007825|u=[[atomic mass unit|u]]}} for [[Hydrogen-1]]), hydrogen is the lightest and [[abundance of the chemical elements|most abundant]] chemical element, constituting roughly 75 % of the Universe's elemental mass.<ref>
{{cite web
|last=Palmer|first=D.
|title=Hydrogen in the Universe
|url=http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/971113i.html
|publisher=[[NASA]]
|date=13 September 1997
|accessdate=2008-02-05
}}</ref> [[Star]]s in the [[main sequence]] are mainly composed of hydrogen in its [[plasma (physics)|plasma]] state. Naturally occurring elemental hydrogen is relatively rare on [[Earth]].
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