90Th
Thorium
토륨 · トリウム
Actinide
Atomic number90
ElementTh — Thorium
Atomic mass232.04
CategoryActinide
Group3
Period7
Electron config[Rn] 6d2 7s2
Shells2,8,18,32,18,10,2
State (RT)Solid
Melting pt1750°C
Boiling pt4788°C
Electronegativity1.3
Discovered1829
Main usesNuclear fuel, gas mantles
2 · 8 · 18 · 32 · 18 · 10 · 2
Group 3
Sc ScandiumY YttriumLa LanthanumCe CeriumPr PraseodymiumNd NeodymiumPm PromethiumSm SamariumEu EuropiumGd GadoliniumTb TerbiumDy DysprosiumHo HolmiumEr ErbiumTm ThuliumYb YtterbiumLu LutetiumAc ActiniumPa ProtactiniumU UraniumNp NeptuniumPu PlutoniumAm AmericiumCm CuriumBk BerkeliumCf CaliforniumEs EinsteiniumFm FermiumMd MendeleviumNo NobeliumLr Lawrencium