User:Patrick/Template:Infobox helium

Helium, ₀₀He
Helium
Pronunciation	/ˈhiːliəm/ ⓘ (HEE-lee-əm)
Appearance	Colorless gas, exhibiting a purple glow when placed in a high voltage electric field
Standard atomic weight Ar°(He)
	4.002602±0.000002; 4.0026±0.0001 (abridged);
Helium in the periodic table
Group	group 18 (noble gases)
Period	period 1
Block	s-block
Electron configuration	1s2
Electrons per shell	2
Physical properties
Phase at STP	gas
Melting point	(at 2.5 MPa) 0.95 K (−272.20 °C, −457.96 °F)
Boiling point	4.22 K (−268.93 °C, −452.07 °F)
Density (at STP)	0.1786 g/L
when liquid (at m.p.)	0.145 g/cm3
Critical point	5.19 K, 0.227 MPa
Heat of fusion	0.0138 kJ/mol
Heat of vaporization	0.0829 kJ/mol
Molar heat capacity	20.786 J/(mol·K)
Atomic properties
Oxidation states	common: (none);
Electronegativity	Pauling scale: no data
Covalent radius	28 pm
Van der Waals radius	140 pm
	Spectral lines of helium
Other properties
Natural occurrence	primordial
Crystal structure	hexagonal close-packed (hcp)
Thermal conductivity	0.1513 W/(m⋅K)
Magnetic ordering	diamagnetic
Speed of sound	972 m/s
CAS Number	7440-59-7
Isotopes of helium v; e;
	Category: Helium; view; talk; edit; \| references

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^ "Standard Atomic Weights: Helium". CIAAW. 1983.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
^ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.
^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.

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