Periodic table of the elements
KryptonRubidiumStrontium
37
Rb
Rubidium
85.4678
2
8
18
8
1
37
Rb
Rubidium
85.4678
2
8
18
8
1
General
NameRubidium
SymbolRb
Number37
Chemical seriesAlkali metals
Group / Period1 / 5
Blocks-block
CAS registry number7440-17-7

Physical properties
Statesolid
Density1.532 g/cm3
Melting point312.46 K (39.31°C, 102.76°F)
Boiling point961 K (688°C, 1270°F)
Critical point2093 K, 16 MPa

Atomic properties
Atomic Weight85.4678 g/mol
Crystal structurecubic body centered
Electronegativity0.82
Atomic radius235 pm
Atomic radius (calculated)265 pm
Electron configuration[Kr] 5s1
Electrons per shell2, 8, 18, 8, 1
Number of protons37
Number of neutrons48

Other languages
SpanishRubidio
PortugueseRubídio
FrenchRubidium
GermanRubidium
ItalianRubidio
RussianРубидий
PolishRubid
Chinese
Arabicروبيديوم
TurkishRubidyum
DutchRubidium


Periodic table of the elements
KryptonRubidiumStrontium