Rubidium

Latin nameRubidium
English nameRubidium
chemical symbolRb
atomic number37
relative atomic mass85,4678
period5
groupI.A
classificationalkaline metals
discovery year1861
discovererW. Bunsen,
G. R. Kirchhoff
melting point [°C]38,89
boiling point [°C]686
critical temperature [°C]1820
critical pressure [MPa]16
density [g cm-3]1,53
density at melting point [g cm-3]1,46
electronegativity [Pauling]0,82
stand. el. potential [V]−2,98
oxidation statesI
electron configuration[Kr]5s1
atomic radius [pm]265
covalent radius [pm]211
specific heat [J g-1K-1]0,363
heat of fusion [kJ mol-1]2,192
thermal conductivity [W m-1 K-1]58,2
el. conductivity [S m-1]4,78.107
1. ionizing potential [eV]4,1771
2. ionizing potential [eV]27,28
3. ionizing potential [eV]40,0
Mohs hardness0,3
Brinell hardness [MPa]0,216
Young's modulus [GPa]2,4
state at normal conditionssolid

Rubidium is a soft, silvery-white metallic element.

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