Hydrogen

__Hydrogen Information__ Hydrogen is a unique element because it does not belong to any particular group. It is a nonmetal and is usually present as a colorless gas and is the most abundant element. Many planets are composed of Hydrogen in the inside and because of the high temperatures and pressure there, Hydrogen exists in a metallic form. Hydrogen's electron configuration is 1s1 and has only 1 electron.

__Ionization Energy__ The ionization energy (energy needed to remove an electron from an atom) of hydrogen is 1312kJ/mol and is very high compared to the alkali metals below it on the periodic table. Because of this, hydrogen is less likely to lose an electron than the alkali metals. Instead, it shares electrons with nonmetals and forms molecular compounds. These reactions can be very exothermic, as demonstrated in the combustion of Hydrogen to form water.

__Hindenburg__ One of the most famous incidents involving Hydrogen is the Hindenburg. The zeppelin exploded when the hydrogen filled "balloon" caught on fire and the Hydrogen gas combusted.

Sources: [|Wikipedia] AP Chem Book