3D Bohr-model representation of the Iridium atom (symbol Ir, atomic number Z=77). Electron shell configuration: 2, 8, 18, 32, 15, 2 electrons.
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Bohr model · educational
Bohr model of iridium
Iridium (Ir) has 77 electrons, spread over 6 shells. The diagram places them on circles around the nucleus, from the K shell — the closest — outward.
| Shell | Electrons |
|---|---|
| K (n = 1) | 2 |
| L (n = 2) | 8 |
| M (n = 3) | 18 |
| N (n = 4) | 32 |
| O (n = 5) | 15 |
| P (n = 6) | 2 |
The Bohr model is a teaching picture: electrons do not travel in circular orbits, but the number of electrons per shell is exact.
Related lesson
Homogeneous catalysis
Catalysts in solution, transition-metal complexes, Wilkinson's hydrogenation.
13 minElectron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d⁷ 6s²
Short[Xe] 4f¹⁴ 5d⁷ 6s²
Valence electrons9
KLMNOPQ shells
K2
L8
M18
N32
O15
P2
Electronegativity
Pauling2.2
Allen—
Mulliken (eV)—
Atomic radii
Empirical135 pm
Calculated180 pm
Covalent141 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+462.5 pm
Successive ionisation energies
I₁880 kJ/mol
I₂1600 kJ/mol
Electron affinity151 kJ/mol
Oxidation states
-3-10+1+2+3+4+5+6+7+8+9
Bold states = most common.
Warm-up
Iridium — do you remember?
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