Symbol
Tm
Atomic Number
69
Atomic Mass
168.93422
Protons
69
Neutrons
99
Electrons
69
Type
Lanthanide
Isotopes
Thulium-169
Discovery Year
1879
Discovered By
Marcellin Berthelot
Group
3
Period
6
Boiling Point
1545°C
Melting Point
1545°C
Electron Configuration
[Xe] 6s² 4f¹³
Density (g/cm³)
9.32
Crystal Structure
Hexagonal
Magnetism
Paramagnetic
Abundance in Earth's Crust
0.0006%
Phase at Room Temperature
Solid