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{{Element | name=Hydrogen | symbol=H | anumber=1 | amass=1.001 amu | noe=1 | class=Gas| cstructure=Unknown | color=None | }}
{{Element | name=Hydrogen | symbol=H | anumber=1 | amass=1.001 amu | noe=1 | class=Gas| cstructure=Unknown | color=None | }}
'''Hydrogen''' is the most abundant of all the [[element]]s,<ref>Hydrogen makes up roughly 75% of the matter in the [[universe]].</ref> and has the [[chemical symbol]] H and an [[atomic number]] of 1. Despite this abundance, naturally occurring elemental hydrogen is extremely rare on [[Earth]].
'''Hydrogen''' is the most abundant of all the [[element]]s,<ref>Hydrogen makes up roughly 75% of the matter in the [[universe]].</ref> and has the [[chemical symbol]] H and an [[atomic number]] of 1. Despite this abundance, naturally occurring elemental hydrogen is extremely rare on [[Earth]].
==Chemical Properties==
At normal pressures hydrogen melts at 14.01[[Kelvin]] (K) and boils at 20.28K, essentially meaning that it only exists on Earth as a gas. The near-vacuum of interstellar space means that hydrogen is also a gas under these circumstances. Astronomers and chemists hypothesise that hydrogen exists as a plasma inside stars and possibly in a metallic form in the cores of gas giant [[planets]] such as [[Jupiter]].
==Isotopes==
==Isotopes==