Actinium
Actinium
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Actinium ΒΆ
AtomicNumber: 89
Element: Actinium
Symbol: Ac
AtomicMass: 227.0
NumberofNeutrons: 138
NumberofProtons: 89
NumberofElectrons: 89
Period: 7
Group: 3.0
Phase: solid
Radioactive: yes
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Actinide
AtomicRadius: nan
Electronegativity: 1.1
FirstIonization: 5.17
Density: 10.1
MeltingPoint: 1323.15
BoilingPoint: 3471.0
NumberOfIsotopes: 11.0
Discoverer: Debierne/Giesel
Year: 1899.0
SpecificHeat: 0.12
NumberofShells: 7
NumberofValence: nan