ToolBoxy
69Tm

Thulium

툴륨 · ツリウム

Lanthanide

Atomic number69
ElementTmThulium
Atomic mass168.93
CategoryLanthanide
Group3
Period6
Electron config[Xe] 4f13 6s2
Shells2,8,18,31,8,2
State (RT)Solid
Melting pt1545°C
Boiling pt1950°C
Electronegativity1.25
Discovered1879
Main usesPortable X-ray sources
Tm69
2 · 8 · 18 · 31 · 8 · 2
Bohr model

Group 3