Thulium (Tm)
Atomic number
69
Mass number
169
Electronegativity
1.25
Covalent radius
1.56
Atomic radius
2.42
Melting point
1818.0
Boiling point
2220.0
Density
9.33
Specific heat
0.16
Electrical conductivity
0.0150e6
Thermal conductivity
0.168