User:Patrick/Template:Infobox helium/doc

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Adapted from Template:Infobox helium by just modifying the first line. See also Wikipedia talk:WikiProject Elements#Making the data in the infoboxes independently retrievable.

{{User:Patrick/Template:Infobox helium|Elementbox}} gives the infobox on the right.

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
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson - ↑ He ↓ Ne hydrogen ← helium → lithium
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)
Vapor pressure (defined by ITS-90) P (Pa) 1 10 100 1 k 10 k 100 k at T (K)     1.23 1.67 2.48 4.21
Atomic properties
Oxidation states	0
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
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 3He 0.0002% stable 4He 99.9998% stable

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References

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