Protactinium
Protactinium
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Protactinium ΒΆ
AtomicNumber: 91
Element: Protactinium
Symbol: Pa
AtomicMass: 231.036
NumberofNeutrons: 140
NumberofProtons: 91
NumberofElectrons: 91
Period: 7
Group: nan
Phase: solid
Radioactive: yes
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Actinide
AtomicRadius: nan
Electronegativity: 1.5
FirstIonization: 5.89
Density: 15.4
MeltingPoint: 1873.15
BoilingPoint: 4300.0
NumberOfIsotopes: 14.0
Discoverer: Hahn and Meitner
Year: 1917.0
SpecificHeat: nan
NumberofShells: 7
NumberofValence: nan