helium

URI: https://gptkb.org/entity/helium

GPTKB entity

AI-created image

Statements (60)

Predicate	Object
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