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Rubidium (37Rb85.4678)
[7440-17-7]

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Elemental Form

Rubidium is a soft, silvery-white metal belonging to the alkali group. It is second in the categories of most electropositive and most alkaline elements. Rubidium forms amalgams with mercury and alloys with gold, cesium, sodium, and potassium. It is highly reactive; igniting spontaneously in air and reacting vigorously in water. Rubidium has a high heat capacity and heat transfer coefficient.
Melting Point39°CBoiling Point688°C
Density1.532g/cm3Specific Heat @ 25°C0.033cal/g°C
Heat of Fusion6.14k-cal/g-atomHeat of Vaporization212k-cal/g-atom
Atomic Volume55.9W/DFirst Ionization Energy96K-cal/g-mole
Electronegativity0.8Pauling'sCovalent Radius2.16Angstroms
Mohs Hardness @ 20°C0.3Electrical Resistivity12.1µΩ-cm
Crystal StructureCubic, body centeredThermal Neutron Cross Section0.73barns/atom
Electron Work Function2.09eV