77Ir
Iridium
이리듐 · イリジウム
Transition metal
Atomic number77
ElementIr — Iridium
Atomic mass192.22
CategoryTransition metal
Group9
Period6
Electron config[Xe] 4f14 5d7 6s2
Shells2,8,18,32,15,2
State (RT)Solid
Melting pt2446°C
Boiling pt4428°C
Electronegativity2.2
Discovered1803
Main usesSpark plugs, crucibles
2 · 8 · 18 · 32 · 15 · 2