Radium
Radium
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Radium ΒΆ
AtomicNumber: 88
Element: Radium
Symbol: Ra
AtomicMass: 226.0
NumberofNeutrons: 138
NumberofProtons: 88
NumberofElectrons: 88
Period: 7
Group: 2.0
Phase: solid
Radioactive: yes
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Actinide
AtomicRadius: nan
Electronegativity: 0.9
FirstIonization: 5.2784
Density: 5.5
MeltingPoint: 973.15
BoilingPoint: 2010.0
NumberOfIsotopes: 15.0
Discoverer: Pierre and Marie Curie
Year: 1898.0
SpecificHeat: nan
NumberofShells: 7
NumberofValence: 2.0