Periodic table of the elements
HolmiumErbiumThulium
68
Er
Erbium
167.259
2
8
18
30
8
2
68
Er
Erbium
167.259
2
8
18
30
8
2
General
NameErbium
SymbolEr
Number68
Chemical seriesLanthanides
Group / Period0 / 6
Blockf-block
CAS registry number7440-52-0

Physical properties
Statesolid
Density9.066 g/cm3
Melting point1802 K (1529 °C, 2784 °F)
Boiling point3141 K (2868 °C, 5194 °F)
Critical point

Atomic properties
Atomic Weight167.259 g/mol
Crystal structurehexagonal
Electronegativity1.24
Atomic radius175 pm
Atomic radius (calculated)226 pm
Electron configuration[Xe] 4f12 6s2
Electrons per shell2, 8, 18, 30, 8, 2
Number of protons68
Number of neutrons99

Other languages
SpanishErbio
PortugueseÉrbio
FrenchErbium
GermanErbium
ItalianErbio
RussianЭрбий
PolishErb
Chinese
Arabicإربيوم
TurkishErbiyum
DutchErbium


Periodic table of the elements
HolmiumErbiumThulium