Helium Company Profile

Aggregated data from the web about Helium

Company Name	Helium
Website	https://en.wikipedia.org
Snippet	Helium (from Greek: ἥλιος, romanized: Helios, lit. 'Sun') is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.Its boiling point is the lowest among all the elements.Helium is the second lightest and second most abundant element in the observable ...
3He	0.0002%
4He	99.9998%
Block	s-block
Group	group 18 (noble gases)
Naming	after Helios, Greek Titan of the Sun
P (Pa)	Vapor pressure (defined by ITS-90)P (Pa)1101001 k10 k100 kat T (K) 1.231.672.484.21
Period	period 1
at T (K)
Discovery	Pierre Janssen, Norman Lockyer (1868)
Isotope	IsotopeAbundanceHalf-life (t1/2)Decay modeProduct3He0.0002%stable4He99.9998%stable
Appearance	colorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field
CAS Number	7440-59-7
Phase at STP	gas
Triple point	2.177 K, 5.043 kPa
Boiling point	4.222 K (−268.928 °C, −452.070 °F)
Melting point	0.95 K (−272.20 °C, −457.96 °F) (at 2.5 MPa)
Pronunciation	/ˈhiːliəm/ (HEE-lee-əm)
Critical point	5.1953 K, 0.22746 MPa
Heat of fusion	0.0138 kJ/mol
Speed of sound	972 m/s
Covalent radius	28 pm
First isolation	William Ramsay, Per Teodor Cleve, Abraham Langlet (1895)
Density (at STP)	0.1786 g/L
Element category	Noble gas
Oxidation states	0
Atomic number (Z)	2
Crystal structure	hexagonal close-packed (hcp)
Electronegativity	Pauling scale: no data
Magnetic ordering	diamagnetic[3]
Natural occurrence	primordial
Electrons per shell	2
Ionization energies	1st: 2372.3 kJ/mol, 2nd: 5250.5 kJ/mol,
Molar heat capacity	20.78 J/(mol·K)[2]
Heat of vaporization	0.0829 kJ/mol
Thermal conductivity	0.1513 W/(m·K)
Van der Waals radius	140 pm
when liquid (at b.p.)	0.125 g/cm3
when liquid (at m.p.)	0.145 g/cm3
Electron configuration	1s2
Magnetic susceptibility	−1.88·10−6 cm3/mol (298 K)[4]
Standard atomic weight.mw-parser-output .nobold{font-weight:normal} Ar, std(He)	4.002602(2)[1]

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