Caesium (Cs)
Atomic number
55
Mass number
133
Electronegativity
0.79
Covalent radius
2.35
Atomic radius
3.34
Melting point
301.55
Boiling point
944.0
Density
1.873
Specific heat
0.24
Electrical conductivity
0.0489e6
Thermal conductivity
0.359