helium-4
E761917
Helium-4 is the most common stable isotope of helium, consisting of two protons and two neutrons, and is a key product of both Big Bang nucleosynthesis and stellar fusion.
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
alpha particle
ⓘ
boson ⓘ helium isotope ⓘ nucleus ⓘ stable isotope ⓘ |
| atomicNumber | 2 ⓘ |
| bindingEnergyPerNucleon | ≈7.07 MeV ⓘ |
| boilingPointAt1atm | ≈4.22 K ⓘ |
| bosonicStatistics | Bose–Einstein NERFINISHED ⓘ |
| charge | +2e (nucleus) ⓘ |
| chemicalElement | helium ⓘ |
| cosmologicalMassFraction | ≈0.24–0.25 of baryonic matter ⓘ |
| discoveredAsAlphaParticleBy | Ernest Rutherford NERFINISHED ⓘ |
| dominantIsotopeOf | helium ⓘ |
| electricCharge | +2 elementary charges ⓘ |
| firstIonizationEnergy | same as helium ≈24.6 eV ⓘ |
| formationProcess |
Big Bang nucleosynthesis
NERFINISHED
ⓘ
alpha decay of heavier nuclei ⓘ stellar hydrogen fusion ⓘ |
| formsSuperfluidPhase | true ⓘ |
| isAlphaParticle | true ⓘ |
| isMagicNucleus | true ⓘ |
| isStable | true ⓘ |
| magicNeutronNumber | 2 ⓘ |
| magicProtonNumber | 2 ⓘ |
| mass |
≈4.002602 u
ⓘ
≈6.6465×10^-27 kg ⓘ |
| massNumber | 4 ⓘ |
| meltingPointAt1atm | doesNotMelt (solidifies only under pressure) ⓘ |
| naturalAbundanceInHelium | >0.99 ⓘ |
| neutronNumber | 2 ⓘ |
| neutronSeparationEnergy | high ⓘ |
| nuclearSpin | 0 ⓘ |
| nucleonNumber | 4 ⓘ |
| occursIn |
Sun
NERFINISHED
ⓘ
interstellar medium ⓘ main-sequence stars ⓘ |
| productOf |
CNO cycle
NERFINISHED
ⓘ
proton–proton chain reaction ⓘ |
| protonNumber | 2 ⓘ |
| protonSeparationEnergy | high ⓘ |
| radioactive | false ⓘ |
| roleInCosmology | key probe of Big Bang nucleosynthesis ⓘ |
| superfluidTransitionTemperature | ≈2.17 K (lambda point) ⓘ |
| symbol | 4He ⓘ |
| totalBindingEnergy | ≈28.3 MeV ⓘ |
| usedAs |
carrier gas in some analytical instruments
ⓘ
coolant for superconducting magnets ⓘ cryogenic coolant ⓘ working fluid in low-temperature physics experiments ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.