Thallium (Tl)
Atomic number
81
Mass number
204
Electronegativity
2.04
Covalent radius
1.55
Atomic radius
2.08
Melting point
577.0
Boiling point
1746.0
Density
11.85
Specific heat
0.13
Electrical conductivity
0.0617e6
Thermal conductivity
0.461