|
gptkbp:instanceOf
|
gptkb:chemical_compound
|
|
gptkbp:abundanceInUniverse
|
second most abundant element
|
|
gptkbp:aroma
|
odorless
|
|
gptkbp:atomicNumber
|
2
|
|
gptkbp:atomicRadius
|
31 pm
|
|
gptkbp:block
|
s-block
|
|
gptkbp:boilingPoint
|
-268.93 °C
|
|
gptkbp:CASNumber
|
7440-59-7
|
|
gptkbp:category
|
noble gas
nonmetal
|
|
gptkbp:color
|
colorless
|
|
gptkbp:criticalFor
|
5.2 K, 2.29 atm
|
|
gptkbp:crystalSystem
|
hexagonal close-packed
|
|
gptkbp:density
|
0.1786 g/L
|
|
gptkbp:discoveredBy
|
gptkb:Norman_Lockyer
gptkb:Pierre_Janssen
|
|
gptkbp:discoveredIn
|
1868
|
|
gptkbp:electronConfiguration
|
1s2
|
|
gptkbp:firstSpectroscopicallyDetected
|
Sun
|
|
gptkbp:flammability
|
false
|
|
gptkbp:foundIn
|
gptkb:Earth's_atmosphere
natural gas
stars
|
|
gptkbp:hardness
|
not applicable
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
helium
|
|
gptkbp:ionizationEnergy
|
24.587 eV
|
|
gptkbp:isomerOf
|
gptkb:helium-4
helium-3
|
|
gptkbp:IUPACName
|
gptkb:helium
|
|
gptkbp:magneticOrdering
|
diamagnetic
|
|
gptkbp:mainIsotope
|
gptkb:helium-4
|
|
gptkbp:meltingPoint
|
does not solidify at standard pressure
|
|
gptkbp:molecularWeight
|
4.002602 g/mol
|
|
gptkbp:namedAfter
|
gptkb:Helios
|
|
gptkbp:nobleGas
|
true
|
|
gptkbp:oxidationStates
|
0
|
|
gptkbp:period
|
1
|
|
gptkbp:phaseAtSTP
|
gptkb:gasoline
|
|
gptkbp:producedBy
|
nuclear fusion in stars
radioactive decay of heavy elements
|
|
gptkbp:radioactive
|
false
|
|
gptkbp:refractiveIndex
|
1.000035
|
|
gptkbp:relatedGroup
|
18
|
|
gptkbp:solubility
|
very low
|
|
gptkbp:standardState
|
gptkb:gasoline
|
|
gptkbp:symbol
|
He
|
|
gptkbp:thermalConductivity
|
0.1513 W/(m·K)
|
|
gptkbp:toxicity
|
non-toxic
|
|
gptkbp:triplePoint
|
not applicable
|
|
gptkbp:uses
|
cryogenics
balloons
airships
breathing mixtures for deep-sea diving
pressurizing and purging systems
shielding gas in welding
|
|
gptkbp:bfsParent
|
gptkb:Saturn_(planet)
gptkb:CNO_cycle
gptkb:Sir_William_Ramsay
gptkb:The_Sun
|
|
gptkbp:bfsLayer
|
4
|