Thulium
Atomic symbol: Tm
Atomic number: 69
Atomic mass: 168.93
Appearance: Silver gray solid at 25°C
Group: N/a
Period: 6
Series: Lanthanides
Block: f
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹³ 6s²
Soft, malleable and ductile.
Rare and difficult to extract, thulium is an expensive metal.
Fun Fact! Thulium was discovered alongside holmium, and has similar uses/ applications in industry and medicine to erbium.