Periodic table of the elements
BariumLanthanumCerium
57
La
Lanthanum
138.90547
2
8
18
18
9
2
57
La
Lanthanum
138.90547
2
8
18
18
9
2
General
NameLanthanum
SymbolLa
Number57
Chemical seriesLanthanides
Group / Period0 / 6
Blockf-block
CAS registry number7439-91-0

Physical properties
Statesolid
Density6.162 g/cm3
Melting point1193 K (920 °C, 1688 °F)
Boiling point3737 K (3464 °C, 6267 °F)
Critical point

Atomic properties
Atomic Weight138.90547 g/mol
Crystal structurehexagonal
Electronegativity1.10
Atomic radius195 pm
Atomic radius (calculated)
Electron configuration[Xe] 5d1 6s2
Electrons per shell2, 8, 18, 18, 9, 2
Number of protons57
Number of neutrons82

Other languages
SpanishBario
PortugueseLantânio
FrenchLanthane
GermanLanthan
ItalianLantanio
RussianЛантан
PolishLantan
Chinese
Arabicلانثانوم
TurkishLantan
DutchLanthanium


Periodic table of the elements
BariumLanthanumCerium