Argon
Argon
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Argon ΒΆ
AtomicNumber: 18
Element: Argon
Symbol: Ar
AtomicMass: 39.948
NumberofNeutrons: 22
NumberofProtons: 18
NumberofElectrons: 18
Period: 3
Group: 18.0
Phase: gas
Radioactive: nan
Natural: yes
Metal: nan
Nonmetal: yes
Metalloid: nan
Type: Noble Gas
AtomicRadius: 0.88
Electronegativity: nan
FirstIonization: 15.7596
Density: 0.00178
MeltingPoint: 83.96
BoilingPoint: 87.3
NumberOfIsotopes: 8.0
Discoverer: Rayleigh and Ramsay
Year: 1894.0
SpecificHeat: 0.52
NumberofShells: 3
NumberofValence: 8.0