Rubidium
Symbol
Rb
Atomic Number
37
Atomic Weight
85.4678
Element Classification
Discovered By
R. Bunsen, G. Kirchoff
Discovery Date
1861 (Germany)
Name Origin
Latin: rubidus (deep red), the color its salts impart to flames.
Density (g/cc)
1.532
Melting Point (K)
312.2
Boiling Point (K)
961
Appearance
Soft, silvery-white, highly reactive metal
Atomic Radius (pm)
248
Atomic Volume (cc/mol)
55.9
Covalent Radius (pm)
216
Ionic Radius
147 (+1e)
Specific Heat
0.360
Fusion Heat (kJ/mol)
2.20
Evaporation Heat (kJ/mol)
75.8
Thermal Conductivity (@25°C W/m K)
58.2
Debye Temperature (K)
n/a
Pauling Negativity Number
0.82
First Ionizing Energy (kJ/mol)
402.8
Oxidation States
1
Electronic Configuration
[Kr] 5s1
Lattice Structure
Body-Centered Cubic(BCC)
Lattice Constant
5.590
Lattice C/A Ratio
n/a
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