Hydrogen
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Element
Hydrogen has 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. 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 popular component in many reactions and molecules. Its most popular molecule is H2O, or water.
Hydrogen In Halo
Hydrogen is a gas used to fuel some UNSC vehicles, such as the Warthog and Mongoose. There are also some Hydrogen barrels in Halo 2 and 3.
