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{{ | {{Wikipedia|Hydrogen}} | ||
[[File:Hydrogen.jpg|thumb|150px|A barrel containing Hydrogen.]] | |||
Hydrogen is the first element in the Periodic Table | '''Hydrogen''' is a chemical element with an atomic number of 1; it is the first element in the Periodic Table and is the lightest with a molar mass of 1.00794 g/mol. It has an atomic radius of 78 pm. In its natural diatomic state, it is a colorless, odorless, tasteless gas. It is a very flammable gas and is the lightest element. Its low atomic number makes it a very common component in many reactions and molecules. | ||
Hydrogen is the most common element in the entire universe because it makes up almost all stars (the rest of stars' mass is mostly [[helium]]). When purely combusted with oxygen, the (chemical equation 2H<sub>2</sub> + O<sub>2</sub> ---> 2H<sub>2</sub>O) it forms water and heat, a very useful reaction with a clean result. | |||
Hydrogen is | |||
[[Category: | As fossil fuels have largely been abandoned, hydrogen is one of [[human]]ity's current top power sources, commonly used in fuel cells and as fuel in [[Nuclear fusion|fusion reactors]] along with [[deuterium]]. An example of a hydrogen-powered reactor is the [[UNSC Reactor|reactor unit]] used to power [[Firebase|prefabricated bases]].<ref>[http://www.halowars.com/GameInfo/firebase.aspx '''Halowars.com''': ''Firebase'']</ref> Hydrogen gas is also used to fuel some [[United Nations Space Command|UNSC]] [[vehicles]], such as the [[M12 Light Reconnaissance Vehicle|Warthog]] and [[M274 Ultra-Light All-Terrain Vehicle|Mongoose]].<ref>[http://halo.bungie.net/News/content.aspx?type=topnews&link=BAGwarthog '''Bungie.net''': ''The Warthog'']</ref><ref>[http://halo.bungie.net/News/content.aspx?type=topnews&link=BAGMongoose '''Bungie.net''': ''The Mongoose'']</ref> | ||
==Sources== | |||
{{Ref/Sources}} | |||
[[Category:Elements]] |