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General properties
Name, simbolo, kaiphan rubidium, Rb, 37
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category puthaw
Group, period, block 15, s
Standard atomic weight 85.4678(3)
Electron configuration [Kr] 5s1
2, 8, 18, 8, 1
Electron shells of rubidium (2, 8, 18, 8, 1)
Discovery Robert Bunsen and Gustav Kirchhoff (1861)
First isolation George de Hevesy
Physical properties
Phase magahi
Density (near r.t.) 1.532 g·cm−3
Liquid density at m.p. 1.46 g·cm−3
Melting point 312.46 K, 39.31 °C, 102.76 °F
Boiling point 961 K, 688 °C, 1270 °F
Critical point (extrapolated) 2093 K, 16 MPa
Heat of fusion 2.19 kJ·mol−1
Heat of vaporization 75.77 kJ·mol−1
Molar heat capacity 31.060 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 434 486 552 641 769 958
Atomic properties
Oxidation states 1
(strongly basic oxide)
Electronegativity 0.82 (Pauling scale)
Ionization energies 1st: 403 kJ·mol−1
2nd: 2632.1 kJ·mol−1
3rd: 3859.4 kJ·mol−1
Atomic radius 248 pm
Covalent radius 220±9 pm
Van der Waals radius 303 pm
Crystal structure body-centered cubic
Rubidium has a body-centered cubic crystal structure
Magnetic ordering paramagnetic[1]
Electrical resistivity (20 °C) 128 nΩ·m
Thermal conductivity 58.2 W·m−1·K−1
Speed of sound (thin rod) (20 °C) 1300 m·s−1
Young's modulus 2.4 GPa
Bulk modulus 2.5 GPa
Mohs hardness 0.3
Brinell hardness 0.216 MPa
CAS registry number 7440-17-7
Most stable isotopes
Main article: Isotopes of rubidium
iso NA half-life DM DE (MeV) DP

Plantilya:Infobox element/isotopes decay2 Plantilya:Infobox element/isotopes decay4 Plantilya:Infobox element/isotopes stable Plantilya:Infobox element/isotopes decay2 Plantilya:Infobox element/isotopes decay

t  h  u
· r

Ang rubidyo (Iningles rubidium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Rb ug kaiphan nga atomik 37. Ang rubidyo mao ang puthaw.

Ang mga gi basihan niini[usba | edit source]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.

Galeriya sa hulagway[usba | edit source]