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Rubidium (₃₇Rb^85.4678)
[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 Point	39°C	Boiling Point	688°C
Density	1.532g/cm³	Specific Heat @ 25°C	0.033cal/g°C
Heat of Fusion	6.14k-cal/g-atom	Heat of Vaporization	212k-cal/g-atom
Atomic Volume	55.9W/D	First Ionization Energy	96K-cal/g-mole
Electronegativity	0.8Pauling's	Covalent Radius	2.16Angstroms
Mohs Hardness @ 20°C	0.3	Electrical Resistivity	12.1µΩ-cm
Crystal Structure	Cubic, body centered	Thermal Neutron Cross Section	0.73barns/atom
Electron Work Function	2.09eV