Periodic table of the elements
CaesiumBariumLanthanum
56
Ba
Barium
137.327
2
8
18
18
8
2
56
Ba
Barium
137.327
2
8
18
18
8
2
General
NameBarium
SymbolBa
Number56
Chemical seriesAlkaline earth metals
Group / Period2 / 6
Blocks-block
CAS registry number7440-39-3

Physical properties
Statesolid
Density3.51 g/cm3
Melting point1000 K (727°C, 1341°F)
Boiling point2170 K (1897 °C, 3447 °F)
Critical point

Atomic properties
Atomic Weight137.327 g/mol
Crystal structurecubic body centered
Electronegativity0.89
Atomic radius215 pm
Atomic radius (calculated)253 pm
Electron configuration[Xe] 6s2
Electrons per shell2, 8, 18, 18, 8, 2
Number of protons56
Number of neutrons82

Other languages
SpanishBario
PortugueseBário
FrenchBaryum
GermanBarium
ItalianBario
RussianБарий
PolishBar
Chinese
Arabicباريوم
TurkishBaryum
DutchBarium


Periodic table of the elements
CaesiumBariumLanthanum