Cesium
Symbol
Cs
Atomic Number
55
Atomic Weight
132.90543
Element Classification
Discovered By
Gustov Kirchoff, Robert Bunsen
Discovery Date
1860 (Germany)
Name Origin
Latin: coesius (sky blue), for the blue lines of its spectrum.
Density(g/cc)
1.873
Melting Point
301.6
Boiling Point(K)
951.6
Appearance
Very soft, ductile, light gray metal
Atomic Radius(pm)
267
Atomic Volume(cc/mol)
70.0
Covalent Radius(pm)
235
Ionic Radius
167 (+1e)
Specific Heat
0.241
Fusion Heat
2.09
Evaporation Heat(kj/mol)
68.3
Thermal Conductivity(@25°C W/m K)
35.9
Debye Temperature
n/a
Pauling Negativity Number
0.79
First Ionizing Energy(kj/mol)
375.5
Oxidation States
1
Electronic Configuration
[Xe] 6s1
Lattice Structure
Body-Centered Cubic(BCC)
Lattice Constant
6.050
Lattice C/A Ratio
n/a
