Helium
Helium
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Helium ΒΆ
AtomicNumber: 2
Element: Helium
Symbol: He
AtomicMass: 4.002
NumberofNeutrons: 2
NumberofProtons: 2
NumberofElectrons: 2
Period: 1
Group: 18.0
Phase: gas
Radioactive: nan
Natural: yes
Metal: nan
Nonmetal: yes
Metalloid: nan
Type: Noble Gas
AtomicRadius: 0.49
Electronegativity: nan
FirstIonization: 24.5874
Density: 0.000179
MeltingPoint: nan
BoilingPoint: 4.22
NumberOfIsotopes: 5.0
Discoverer: Janssen
Year: 1868.0
SpecificHeat: 5.193
NumberofShells: 1
NumberofValence: nan