Rubidium was discovered in 1861 by German chemists Robert Bunsen (1811-99) and Gustav Kirchhoff (1824-87), in the mineral lepidolite through the use of a spectroscope.
Name: Rubidium Symbol: Rb Atomic number: 37 Atomic weight: 85.468 State: solid Group, period, block: 1, 5, s Color: grey white Classification: alkali metal Electron configuration: 5s1
Density: 1.532 g/cm-3 Melting point: 312.46 K,39.31 °C,102.76 °F Boiling point: 961 K,688 °C,1270 °F
Oxidation states: 1 Electronegativity: 0.82 (Pauling scale) Ionization energies: 1st: 403 kJ·mol-1 Covalent radius: 220±9 pm Van der Waals radius: 303 pm
There are two naturally occurring isotopes of rubidium exist, 85Rb, and 87Rb.