helium 3 | has symbol 3He | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has natural abundance 0.000137 % stable isotope | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has NMR frequency 76.178 MHz where 1H = 100 MHz; 2.3488 T | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has magnetogyric ratio -20.378 × 107 rad T-1 s-1 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has NMR receptivity 0.00326 where 13C = 1.00 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has relative NMR sensitivity 0.44 where 1H = 1.00 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has nuclear magnetic moment μ = -2.127624 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has nuclear spin I = 1/2 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has number of nucleons 3 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has number of neutrons 1 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has atomic mass 3.01602931 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has uses Nuclear Magnetic Resonance, tracer | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
is an instance of helium | ![has URL: http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=20003, 2001-09-27 09:28:50.0 has URL: http://nucleardata.nuclear.lu.se/nucleardata/toi/nuclide.asp?iZA=20003, 2001-09-27 09:28:50.0](facet.gif) |
helium | has stable isotope helium 3, helium 4 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has lethal intake non-toxic | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has reserves 3.7 × 109 tonnes in Earth's atmosphere | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has mineral present in some minerals | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has neutron scattering length 0.326 × 10-12 cm | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has electron affinity 0.0 kJ mol-1 from to - | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has toxic intake non-toxic | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has mass magnetic susceptibility -5.9 × 10-9 kg-1 m3 for gas | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has van der Waals radii 120 pm | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has thermal neutron capture cross section 0.007 barns | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has longest lived isotope helium 4 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has isotope mass range 3 to 8 except 7 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has number of isotopes 5 including nuclear isomers | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has pronunciation heel-iuhm | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has name origin helios = sun from Greek | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has discovery location England | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has abundance 6.31 × 1010 in Sun relative to H = 1 × 1012 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has abundance 0.008 p.p.m. in Earth's crust | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has abundance 5.2 p.p.m. by volume in Earth's atmosphere | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has abundance 4 × 10-6 p.p.m. in seawater | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has specimen small pressurized canisters. Safe. | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has world production 4500 tonnes year-1 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has chief source natural gas which may contain up to 7% helium | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has mass absorption coefficient 0.383 cm2 g-1 for CuKα X-ray diffraction | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has mass absorption coefficient 0.207 cm2 g-1 for MoKα X-ray diffraction | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has space group P63/mmc for α-He at 1.15 K, 6.69 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has space group Fm3m for β-He at 16K, 127 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has space group Im3m for γ-He at 1.73 K, 2.94 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has crystal cell dimension a = 353.1, c = 569.3 pm for α-He at 1.15 K, 6.69 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has crystal cell dimension a = 424.0 pm for β-He at 16K, 127 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has crystal cell dimension a = 411 pm for γ-He at 1.73 K, 2.94 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has crystal type h.c.p. for α-He at 1.15 K, 6.69 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has crystal type f.c.c. for β-He at 16K, 127 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has crystal type b.c.c. for γ-He at 1.73 K, 2.94 MPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has atomic emission line 388.865 nm for He I | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has atomic emission line 587.562 nm for He I | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has atomic emission line 1083.025 nm for He I | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has atomic emission line 1083.034 nm for He I (strong) | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has atomic emission line 1868.534 nm for He I | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has atomic emission line 2058.130 nm for He I | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has term symbol 1S0 in ground state | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has electron configuration 1s2 = [He] in ground state | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has mass of element in person very small for a 70 kg average person | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has daily dietary intake very low | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has level in humans traces | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has hazard harmless but could asphyxiate if it excludes oxygen from the lungs | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has biological role none | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has thermal conductivity 0.152 W m-1 K-1 at 300 K | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has molar volume 32.07 cm3 at 4 K | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has heat capacity 20.786 J K-1 mol-1 for gas at constant pressure 0.1 MPa at 298.15 K | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has heat of vaporization 0.082 kJ mol-1 | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has heat of fusion 0.021 kJ mol-1 | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has boiling point 4.216 K | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has melting point 0.95 K under pressure | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has relative atomic mass 4.005602 in units of 12C = 12.000 | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has atomic radii 128 pm | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has number of protons 2 | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has registry number 7440-59-7 for Chemical Abstracts System database | ![has URL: http://info.cas.org, 2001-09-27 09:28:49.0 has URL: http://info.cas.org, 2001-09-27 09:28:49.0](facet.gif) |
has density 124.8 kg m-3 for liquid at 4.216 K boiling point | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has density 0.1785 kg m-3 for gas at 273 K | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has synthesis mechanism | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has ocean oxidation state 0 | ![2001-09-27 09:28:27.0 2001-09-27 09:28:27.0](facet.gif) |
has atomic number 2 | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
reacts with nothing | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has discovery date 1868 | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has discoverer Norman Lockyer and Edward Frankland | ![2001-09-27 09:28:50.0 2001-09-27 09:28:50.0](facet.gif) |
has image ![](images/element/He.jpg) | ![2001-09-27 09:28:32.0 2001-09-27 09:28:32.0](facet.gif) |
has critical pressure 229 kPa | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
has critical temperature 5.25 K | ![2001-09-27 09:28:49.0 2001-09-27 09:28:49.0](facet.gif) |
unclassified oceanic element | has ocean residence time unknown | ![2001-09-27 09:28:26.0 2001-09-27 09:28:26.0](facet.gif) |
has ocean concentration unknown | ![2001-09-27 09:28:26.0 2001-09-27 09:28:26.0](facet.gif) |
inert gas | has group 18 | ![2001-09-27 09:28:25.0 2001-09-27 09:28:25.0](facet.gif) |
has synonym group VIII element | ![2001-09-27 09:28:25.0 2001-09-27 09:28:25.0](facet.gif) |
has synonym noble gas | ![2001-09-27 09:28:25.0 2001-09-27 09:28:25.0](facet.gif) |
element | is a part of Universe | ![2001-09-27 09:32:17.0 2001-09-27 09:32:17.0](facet.gif) |
oceanic element | has occurrence ocean | ![2001-09-27 09:28:26.0 2001-09-27 09:28:26.0](facet.gif) |
atmophile element | has occurrence atmosphere of a planet or asteroid | ![2001-09-27 09:28:26.0 2001-09-27 09:28:26.0](facet.gif) |
gaseous element | has state gas at standard temperature and pressure | ![2001-09-27 09:28:25.0 2001-09-27 09:28:25.0](facet.gif) |
particle | obeys uncertainty principle | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
has frequency inversely proportional to the wavelength | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
has wavelength inversely proportional to its momentum | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
has charge | ![2001-09-27 09:28:01.0 2001-09-27 09:28:01.0](facet.gif) |
has mass | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
physical object | has location or center of gravity | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has angular momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has velocity | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has temperature | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has volume | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has extent | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has material | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |