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helium (He, 1S0 in ground state) | ||||
subject | fact |
helium | has symbol He | |
has stable isotope helium 3, helium 4 | ||
has lethal intake non-toxic | ||
has reserves 3.7 × 109 tonnes in Earth's atmosphere | ||
has mineral present in some minerals | ||
has neutron scattering length 0.326 × 10-12 cm | ||
has electron affinity 0.0 kJ mol-1 from to - | ||
has toxic intake non-toxic | ||
has mass magnetic susceptibility -5.9 × 10-9 kg-1 m3 for gas | ||
has van der Waals radii 120 pm | ||
has thermal neutron capture cross section 0.007 barns | ||
has longest lived isotope helium 4 | ||
has isotope mass range 3 to 8 except 7 | ||
has number of isotopes 5 including nuclear isomers | ||
has pronunciation heel-iuhm | ||
has name origin helios = sun from Greek | ||
has discovery location England | ||
has abundance 6.31 × 1010 in Sun relative to H = 1 × 1012 | ||
has abundance 0.008 p.p.m. in Earth's crust | ||
has abundance 5.2 p.p.m. by volume in Earth's atmosphere | ||
has abundance 4 × 10-6 p.p.m. in seawater | ||
has specimen small pressurized canisters. Safe. | ||
has world production 4500 tonnes year-1 | ||
has chief source natural gas which may contain up to 7% helium | ||
has mass absorption coefficient 0.383 cm2 g-1 for CuKα X-ray diffraction | ||
has mass absorption coefficient 0.207 cm2 g-1 for MoKα X-ray diffraction | ||
has space group P63/mmc for α-He at 1.15 K, 6.69 MPa | ||
has space group Fm3m for β-He at 16K, 127 MPa | ||
has space group Im3m for γ-He at 1.73 K, 2.94 MPa | ||
has crystal cell dimension a = 353.1, c = 569.3 pm for α-He at 1.15 K, 6.69 MPa | ||
has crystal cell dimension a = 424.0 pm for β-He at 16K, 127 MPa | ||
has crystal cell dimension a = 411 pm for γ-He at 1.73 K, 2.94 MPa | ||
has crystal type h.c.p. for α-He at 1.15 K, 6.69 MPa | ||
has crystal type f.c.c. for β-He at 16K, 127 MPa | ||
has crystal type b.c.c. for γ-He at 1.73 K, 2.94 MPa | ||
has atomic emission line 388.865 nm for He I | ||
has atomic emission line 587.562 nm for He I | ||
has atomic emission line 1083.025 nm for He I | ||
has atomic emission line 1083.034 nm for He I (strong) | ||
has atomic emission line 1868.534 nm for He I | ||
has atomic emission line 2058.130 nm for He I | ||
has term symbol 1S0 in ground state | ||
has electron configuration 1s2 = [He] in ground state | ||
has mass of element in person very small for a 70 kg average person | ||
has daily dietary intake very low | ||
has level in humans traces | ||
has hazard harmless but could asphyxiate if it excludes oxygen from the lungs | ||
has biological role none | ||
has thermal conductivity 0.152 W m-1 K-1 at 300 K | ||
has molar volume 32.07 cm3 at 4 K | ||
has heat capacity 20.786 J K-1 mol-1 for gas at constant pressure 0.1 MPa at 298.15 K | ||
has heat of vaporization 0.082 kJ mol-1 | ||
has heat of fusion 0.021 kJ mol-1 | ||
has boiling point 4.216 K | ||
has melting point 0.95 K under pressure | ||
has relative atomic mass 4.005602 in units of 12C = 12.000 | ||
has atomic radii 128 pm | ||
has number of protons 2 | ||
has registry number 7440-59-7 for Chemical Abstracts System database | ||
has density 124.8 kg m-3 for liquid at 4.216 K boiling point | ||
has density 0.1785 kg m-3 for gas at 273 K | ||
has synthesis mechanism | ||
has ocean oxidation state 0 | ||
has atomic number 2 | ||
reacts with nothing | ||
has discovery date 1868 | ||
has discoverer Norman Lockyer and Edward Frankland | ||
has uses deep-sea diving, weather baloons, low temperature research | ||
has image | ||
has definition Colourless, odorless gas obtained mainly from gas wells. Element which, after hydrogen, is the second lightest and second most abundant in the Universe. Its atom comprises two protons and two electrons. The nucleus of helium 4 is sometimes called an alpha particle. Helium is the product of the nuclear fusion of hydrogen in most stars, but this does not explain the overall helium abundance. Most of it was produced by the big bang, with main-sequence stars making an additional contribution. | ||
has definition | ||
is a kind of light element | ||
is a kind of inert gas | ||
is a kind of unclassified oceanic element | ||
has critical pressure 229 kPa | ||
has critical temperature 5.25 K | ||
unclassified oceanic element | has ocean residence time unknown | |
has ocean concentration unknown | ||
inert gas | has group 18 | |
has synonym group VIII element | ||
has synonym noble gas | ||
element | is a part of Universe | |
oceanic element | has occurrence ocean | |
atmophile element | has occurrence atmosphere of a planet or asteroid | |
gaseous element | has state gas at standard temperature and pressure | |
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 helium :
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