|
gptkbp:instanceOf
|
gptkb:chemical_compound
|
|
gptkbp:abundanceInEarthsAtmosphere
|
trace amounts
|
|
gptkbp:abundanceInUniverse
|
second most abundant element
|
|
gptkbp:aroma
|
odorless
|
|
gptkbp:atomicNumber
|
2
|
|
gptkbp:atomicRadius
|
31 pm
|
|
gptkbp:block
|
s-block
|
|
gptkbp:boilingPoint
|
4.222 K
|
|
gptkbp:canExtract
|
fractional distillation of natural gas
|
|
gptkbp:CASNumber
|
7440-59-7
|
|
gptkbp:color
|
colorless
|
|
gptkbp:criticalFor
|
5.2 K, 0.227 MPa
|
|
gptkbp:crystalSystem
|
hexagonal close-packed
|
|
gptkbp:density
|
0.1786 kg/m³
|
|
gptkbp:discoveredBy
|
gptkb:Norman_Lockyer
gptkb:Pierre_Janssen
|
|
gptkbp:discoveredIn
|
1868
spectrometer
|
|
gptkbp:electronConfiguration
|
1s2
|
|
gptkbp:firstIonizationEnergy
|
24.587 eV
|
|
gptkbp:flammability
|
false
|
|
gptkbp:flavor
|
tasteless
|
|
gptkbp:foundIn
|
natural gas fields
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Helium
|
|
gptkbp:inert
|
true
|
|
gptkbp:isomerOf
|
gptkb:Helium-4
gptkb:Helium-3
|
|
gptkbp:magneticOrdering
|
diamagnetic
|
|
gptkbp:meltingPoint
|
0.95 K (at 2.5 MPa)
|
|
gptkbp:molecularWeight
|
4.002602 g/mol
|
|
gptkbp:namedAfter
|
gptkb:Helios
|
|
gptkbp:nobleGas
|
true
|
|
gptkbp:oxidationStates
|
0
|
|
gptkbp:period
|
1
|
|
gptkbp:producedBy
|
radioactive decay
nuclear fusion in stars
|
|
gptkbp:radioactive
|
false
|
|
gptkbp:refractiveIndex
|
1.000035
|
|
gptkbp:relatedGroup
|
18
|
|
gptkbp:solubility
|
very low
|
|
gptkbp:speedOfSound
|
972 m/s (at 0°C)
|
|
gptkbp:standardState
|
gptkb:gasoline
|
|
gptkbp:stateAtRoomTemperature
|
gptkb:gasoline
|
|
gptkbp:superfluidity
|
exhibits in Helium-4 below 2.17 K
|
|
gptkbp:symbol
|
He
|
|
gptkbp:thermalConductivity
|
high
|
|
gptkbp:toxicity
|
non-toxic
|
|
gptkbp:triplePoint
|
not observed at standard pressure
|
|
gptkbp:uses
|
cryogenics
balloons
airships
breathing mixtures for deep-sea diving
shielding gas in welding
pressurizing and purging
|
|
gptkbp:vanDerWaalsRadius
|
140 pm
|
|
gptkbp:bfsParent
|
gptkb:John_Carter
gptkb:Titan
gptkb:比特币
gptkb:Solana
gptkb:Haskell
gptkb:The_Noble_Gases
gptkb:OpenDaylight
|
|
gptkbp:bfsLayer
|
5
|