Lanthanum
Lanthanum
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Lanthanum ΒΆ
AtomicNumber: 57
Element: Lanthanum
Symbol: La
AtomicMass: 138.905
NumberofNeutrons: 82
NumberofProtons: 57
NumberofElectrons: 57
Period: 6
Group: 3.0
Phase: solid
Radioactive: nan
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Lanthanide
AtomicRadius: 2.7
Electronegativity: 1.1
FirstIonization: 5.5769
Density: 6.15
MeltingPoint: 1193.15
BoilingPoint: 3737.0
NumberOfIsotopes: 19.0
Discoverer: Mosander
Year: 1839.0
SpecificHeat: 0.195
NumberofShells: 6
NumberofValence: nan