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Title: Chemistry/Elements/Hydrogen - It's Elemental: Hydrogen Basic physical and historical information.
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It's Elemental - The Element HydrogenPrivacy and Security NoticeJefferson LabJefferson Lab HomeSearchContact JLabScience Education----------------------Science Education HomeTeacher ResourcesStudent ZoneGames and PuzzlesPrograms and EventsSearch EducationIt's ElementalPrevious ElementPrevious ElementTable of ElementsNext ElementNext Element 1HHydrogen1.00794HydrogenAtomic Number:1Atomic Weight:1.00794Melting Point:13.81 K (-259.34°C or -434.81°F)Boiling Point:20.28 K (-252.87°C or -423.17°F)Density:0.00008988 grams per cubic centimeterPhase at Room Temperature:GasElement Classification:Non-metalPeriod Number:1Group Number:1Group Name:noneWhat's in a name?From the Greek words hydro and genes, which together mean "water forming."Say what?Hydrogen is pronounced as HI-dreh-jen.History and Uses:Scientists had been producing hydrogen for years before it was recognized as an element. Written records indicate that Robert Boyle produced hydrogen gas as early as 1671 while experimenting with iron and acids. Hydrogen was first recognized as a distinct element by Henry Cavendish in 1766.Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in the universe. It is estimated that 90% of the visible universe is composed of hydrogen.Hydrogen is the raw fuel that most stars 'burn' to produce energy. The same process, known as fusion, is being studied as a possible power source for use on earth. The sun's supply of hydrogen is expected to last another 5 billion years.Hydrogen is a commercially important element. Large amounts of hydrogen are combined with nitrogen from the air to produce ammonia (NH3) through a process called the Haber process. Hydrogen is also added to fats and oils, such as peanut oil, through a process called hydrogenation. Liquid hydrogen is used in the study of superconductors and, when combined with liquid oxygen, makes an excellent rocket fuel.Hydrogen combines with other elements to form numerous compounds. Some of the common ones are: water (H2O), ammonia (NH3), methane (CH4), table sugar (C12H22O11), hydrogen peroxide (H2O2) and hydrochloric acid (HCl).Hydrogen has three common isotopes. The simplest isotope, called protium, is just ordinary hydrogen. The second, a stable isotope called deuterium, was discovered in 1932. The third isotope, tritium, was discovered in 1934.Estimated Crustal Abundance:1.40×103 milligrams per kilogramEstimated Oceanic Abundance:1.08×105 milligrams per literNumber of Stable Isotopes:2(View all isotope data)Ionization Energy:13.598 eVOxidation States:+1, -1Electron Shell Configuration:1s1This page is maintained by Steve Gagnon.Citation and linking information
 

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It's Elemental: Hydrogen 2008 December

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