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hydrogen (H, 2S1/2 in ground state)
subject			fact

hydrogen	has symbol H
	has stable isotope hydrogen 1, deuterium
	has lethal intake non-toxic
	has reserves almost limitless
	has main mining area
	has mineral water
	has neutron scattering length -0.37390 × 10-12 cm
	has electron affinity 72.8 kJ mol-1 from H to H-
	has toxic intake non-toxic
	has mass magnetic susceptibility -2.50 × 10-8 kg-1 m3 for gas
	has van der Waals radii 120 pm
	has covalent radii 30 pm
	has thermal neutron capture cross section 0.3326 barns
	has longest lived isotope hydrogen 1
	has isotope mass range 1 to 3
	has number of isotopes 3
	has pronunciation hy-dro-jen
	has name origin hydro genes = water forming from Greek
	has discovery location London, England
	has abundance 1 in Sun relative to H = 1 × 1012
	has abundance 1520 p.p.m. in Earth's crust
	has abundance 0.5 p.p.m. by volume in Earth's atmosphere
	has abundance main constituent of water; some dissolved H2 in seawater
	has specimen small pressurized canisters. Warning !
	has world production 350 × 109 m3 year-1 as H2 gas
	has chief source natural methane gas
	has mass absorption coefficient 0.435 cm2 g-1 for CuKα X-ray diffraction
	has mass absorption coefficient 0.380 cm2 g-1 for MoKα X-ray diffraction
	has atomic emission line 434.047 nm for H I
	has atomic emission line 486.133 nm for H I
	has atomic emission line 656.272 nm for H I
	has atomic emission line 656.285 nm for H I (strong)
	has atomic emission line 1875.10 nm for H I
	has term symbol 2S1/2 in ground state
	has electron configuration 1s1 in ground state
	has mass of element in person 7 kg for a 70 kg average person
	has daily dietary intake mainly as water
	has level in humans constituent of water in blood
	has level in humans 52000 p.p.m. in bone
	has level in humans 93000 p.p.m. in liver
	has level in humans 93000 p.p.m. in muscle
	has hazard flammable and explosive when mixed with air; can asphyxiate if it excludes oxygen from lungs
	has biological role constituent element of DNA. Component of water, essential to life.
	has thermal conductivity 0.1815 W m-1 K-1 at 300 K for gas
	has molar volume 13.26 cm3
	has heat capacity 28.824 J K-1 mol-1 for molecular gas (H2) at constant pressure 0.1 MPa at 298.15 K
	has heat capacity 20.784 J K-1 mol-1 for atomic gas at constant pressure 0.1 MPa at 298.15 K
	has heat of vaporization 0.46 kJ mol-1
	has heat of fusion 0.12 kJ mol-1
	has boiling point 20.28 K
	has melting point 14.01 K
	has electronegativity 2.20 Pauling
	has relative atomic mass 1.00794 in units of 12C = 12.000
	has ionic radii 0.00066 pm for H+
	has ionic radii 154 pm for H-
	has atomic radii 78 pm
	has number of protons 1
	has registry number 1333-74-0 for Chemical Abstracts System database
	has density 76.0 kg m-3 for solid at 11 K
	has density 70.8 kg m-3 for liquid at 20.28 K boiling point
	has density 0.08988 for gas at 273 K
	has synthesis mechanism CH4 + 2H2O = 3H2 + CO (main production mechanim)
	has synthesis mechanism electrolysis of brine using a mercury amalgam cell (minor production mechanism)
	has synthesis mechanism steam flowing over red hot coke produces H2 and CO (minor production mechanism)
has ocean oxidation state I
has atomic number 1
reacts with air explosively
has discovery date 1766
has discoverer H. Cavendish
has uses making ammonia, cyclohexane, methanol, etc.
has Spanish translation hidrogeno
has Italian translation idrogeno
has German translation Wasserstoff
has French translation hydrogene
has triple point temperature 13.96 K at 7.2 kPa
has image
has definition Colourless, odourless gas, insuluable in water. Lightest, most abundant element in the Universe. Its atom comprises one proton and one electron. The element occurs both in stars and as interstellar clouds, in regions where it may be neutral (H I regions) or ionized (H II regions). It was produced by the big bang. Hydrogen 1 is the most common isotope; deuterium, is rarer; and tritium, is radioactive.
has definition
is a kind of light element
is a kind of nonmetallic element
is a kind of gaseous element
is a kind of atmophile element
is a kind of unclassified oceanic element
has critical pressure 1297 kPa
has critical temperature 33.35 K
unclassified oceanic element	has ocean residence time unknown
	has ocean concentration unknown
atmophile element	has occurrence atmosphere of a planet or asteroid
gaseous element	has state gas at standard temperature and pressure
element	is a part of Universe
	has synonym atom
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge
	has mass
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of hydrogen :

• deuterium (30 facts) (D, ²H, hydrogen 2) - A rare heavy isotope of hydrogen. Believed to be the first compound nucleus formed in the infant universe. It was discovered in interstellar space in 1965. Because deuterium is quickly destroyed in nuclear reactions, one view is that most of the deuterium in the universe is primordial.
• hydrogen 1 (22 facts) (¹H)
• tritium (16 facts) (³H, hydrogen 3) - A short-lived isotope of hydrogen. Tritium does not exist naturally on Earth.

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