Promethium
Promethium
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Promethium ΒΆ
AtomicNumber: 61
Element: Promethium
Symbol: Pm
AtomicMass: 145.0
NumberofNeutrons: 84
NumberofProtons: 61
NumberofElectrons: 61
Period: 6
Group: nan
Phase: artificial
Radioactive: yes
Natural: nan
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Lanthanide
AtomicRadius: 2.6
Electronegativity: 1.13
FirstIonization: 5.582
Density: 7.26
MeltingPoint: 1204.15
BoilingPoint: 3273.0
NumberOfIsotopes: 14.0
Discoverer: Marinsky et al.
Year: 1945.0
SpecificHeat: nan
NumberofShells: 6
NumberofValence: nan