Atomic Element Z = 77 • Transition Metal
Iridium (Ir) — Atomic Data, Electron Shells & Reactions
Iridium (symbol Ir, atomic number 77) has a standard atomic weight of 192.22 u and ground-state configuration [Xe] 4f14 5d7 6s2.
Atomic Number (Z)
77
IUPAC Symbol
Ir
Standard Atomic Weight
192.22 g/mol
Period / Group / Block
6 / 9 / d-block
Condensed Electron Config
[Xe] 4f14 5d7 6s2
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d7 6s2
Principal Shell Occupancy
[2, 8, 18, 32, 15, 2]
Pauling Electronegativity
2.2
First Ionization Energy
880 kJ/mol
Covalent Radius
141 pm
Melting Point
2719 K (2445.85 °C)
Boiling Point
4701 K (4427.85 °C)
Density
22.56 g/cm³
Oxidation States
+4, +3
Ir (Z=77) — Valence shell highlighted in vermilion