37
85.47
Rb
Rubidium
Identification
CAS Number: 7440-17-7
Discovery Year: 1861
Discoverer: R. Bunsen, G. Kirchoff
Discovery Location: Germany
Properties
Atomic Dimensions
Atomic Radius: 235 pm →
Atomic Radius (Rahm): 240 pm
Covalent Radius: 220.00000000000003 pm →Van der Waals Radius: 303 pm
Metallic Radius: 216 pm
Atomic Volume: 55.9 cm³/mol
Lattice Constant: 5.59 Å
Thermodynamics
Electronic Structure
Electron Config: [Kr] 5s
Block: s
Period: 5 →Group: 1 →Electronegativity: 0.82 →Electron Affinity: 0.48591999999999996 eV →Oxidation States: +1
Abundance & Geochemistry
Crust Abundance: 90 mg/kg
Sea Abundance: 0.12 mg/L
Geochemical Class: alkali metal
Goldschmidt Class: litophile
About
Soft silvery metallic element, belongs to group 1 of the periodic table. Rb-97, the naturally occurring isotope, is radioactive. It is highly reactive, with properties similar to other elements in group 1, like igniting spontaneously in air. Discovered spectroscopically in 1861 by W. Bunsen and G.R. Kirchoff.
Isotopes
Rb-85 85 72.17%
Rb-87 87 27.83%
