Astatine
Astatine
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Astatine ΒΆ
AtomicNumber: 85
Element: Astatine
Symbol: At
AtomicMass: 210.0
NumberofNeutrons: 125
NumberofProtons: 85
NumberofElectrons: 85
Period: 6
Group: 17.0
Phase: solid
Radioactive: yes
Natural: yes
Metal: nan
Nonmetal: yes
Metalloid: nan
Type: Noble Gas
AtomicRadius: 1.4
Electronegativity: 2.2
FirstIonization: 9.3
Density: 7.0
MeltingPoint: 575.15
BoilingPoint: 610.0
NumberOfIsotopes: 21.0
Discoverer: Corson et al.
Year: 1940.0
SpecificHeat: nan
NumberofShells: 6
NumberofValence: 7.0