69Tm
Thulium
툴륨 · ツリウム
Lanthanide
Atomic number69
ElementTm — Thulium
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
2 · 8 · 18 · 31 · 8 · 2
Group 3
Sc ScandiumY YttriumLa LanthanumCe CeriumPr PraseodymiumNd NeodymiumPm PromethiumSm SamariumEu EuropiumGd GadoliniumTb TerbiumDy DysprosiumHo HolmiumEr ErbiumYb YtterbiumLu LutetiumAc ActiniumTh ThoriumPa ProtactiniumU UraniumNp NeptuniumPu PlutoniumAm AmericiumCm CuriumBk BerkeliumCf CaliforniumEs EinsteiniumFm FermiumMd MendeleviumNo NobeliumLr Lawrencium