89Ac
Actinium
악티늄 · アクチニウム
Actinide
Atomic number89
ElementAc — Actinium
Atomic mass227
CategoryActinide
Group3
Period7
Electron config[Rn] 6d1 7s2
Shells2,8,18,32,18,9,2
State (RT)Solid
Melting pt1050°C
Boiling pt3200°C
Electronegativity1.1
Discovered1899
Main usesNeutron sources, research
2 · 8 · 18 · 32 · 18 · 9 · 2
Group 3
Sc ScandiumY YttriumLa LanthanumCe CeriumPr PraseodymiumNd NeodymiumPm PromethiumSm SamariumEu EuropiumGd GadoliniumTb TerbiumDy DysprosiumHo HolmiumEr ErbiumTm ThuliumYb YtterbiumLu LutetiumTh ThoriumPa ProtactiniumU UraniumNp NeptuniumPu PlutoniumAm AmericiumCm CuriumBk BerkeliumCf CaliforniumEs EinsteiniumFm FermiumMd MendeleviumNo NobeliumLr Lawrencium