where any atom can find their perfect match! Name: Hydrogen Nickname: H Height: 1 Weight: Age: 1671 Ethnicity: Gas Children: 1 Hometown: Home less Physical Description: Hobbies: About Me: 1 Colorless, highly flammable explode by spark, heat or sunlight Hydrogen gas forms explosive mixtures with air if it is 4–74% concentrated and with chlorine if it is 5–95% concentrated. The mixtures spontaneously explode by spark, heat or sunlight. the temperature of spontaneous ignition in air, is 500 °C (932 °F) Pure hydrogen-oxygen flames emit ultraviolet light and are nearly invisible to the naked eye, as illustrated by the faint plume of the Space Shuttle Main Engine compared to the highly visible plume of a Space Shuttle Solid Rocket Booster.