Francium
Francium
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Francium ΒΆ
AtomicNumber: 87
Element: Francium
Symbol: Fr
AtomicMass: 223.0
NumberofNeutrons: 136
NumberofProtons: 87
NumberofElectrons: 87
Period: 7
Group: 1.0
Phase: solid
Radioactive: yes
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Alkaline Earth Metal
AtomicRadius: nan
Electronegativity: 0.7
FirstIonization: 4.0727
Density: 1.87
MeltingPoint: 300.15
BoilingPoint: 950.0
NumberOfIsotopes: 21.0
Discoverer: Perey
Year: 1939.0
SpecificHeat: nan
NumberofShells: 7
NumberofValence: 1.0