Erbium
Erbium
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Erbium ΒΆ
AtomicNumber: 68
Element: Erbium
Symbol: Er
AtomicMass: 167.259
NumberofNeutrons: 99
NumberofProtons: 68
NumberofElectrons: 68
Period: 6
Group: nan
Phase: solid
Radioactive: nan
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Lanthanide
AtomicRadius: 2.5
Electronegativity: 1.24
FirstIonization: 6.1077
Density: 9.07
MeltingPoint: 1795.15
BoilingPoint: 3503.0
NumberOfIsotopes: 16.0
Discoverer: Mosander
Year: 1843.0
SpecificHeat: 0.168
NumberofShells: 6
NumberofValence: nan