Selenium
Selenium
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Selenium ΒΆ
AtomicNumber: 34
Element: Selenium
Symbol: Se
AtomicMass: 78.96
NumberofNeutrons: 45
NumberofProtons: 34
NumberofElectrons: 34
Period: 4
Group: 16.0
Phase: solid
Radioactive: nan
Natural: yes
Metal: nan
Nonmetal: yes
Metalloid: nan
Type: Nonmetal
AtomicRadius: 1.2
Electronegativity: 2.55
FirstIonization: 9.7524
Density: 4.81
MeltingPoint: 494.15
BoilingPoint: 958.0
NumberOfIsotopes: 20.0
Discoverer: Berzelius
Year: 1817.0
SpecificHeat: 0.321
NumberofShells: 4
NumberofValence: 6.0