81Tl
Thallium
탈륨 · タリウム
Post-transition
Atomic number81
ElementTl — Thallium
Atomic mass204.38
CategoryPost-transition
Group13
Period6
Electron config[Xe] 4f14 5d10 6s2 6p1
Shells2,8,18,32,18,3
State (RT)Solid
Melting pt304°C
Boiling pt1473°C
Electronegativity1.62
Discovered1861
Main usesElectronics, infrared detectors
2 · 8 · 18 · 32 · 18 · 3