3D Bohr-model representation of the Antimony atom (symbol Sb, atomic number Z=51). Electron shell configuration: 2, 8, 18, 18, 5 electrons.
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Bohr model · educational
Bohr model of antimony
Antimony (Sb) has 51 electrons, spread over 5 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) | 18 |
| O (n = 5) | 5 |
The Bohr model is a teaching picture: electrons do not travel in circular orbits, but the number of electrons per shell is exact.
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p³
Short[Kr] 4d¹⁰ 5s² 5p³
Valence electrons5
KLMNOPQ shells
K2
L8
M18
N18
O5
Electronegativity
Pauling2.05
Allen1.984
Mulliken (eV)—
Atomic radii
Empirical145 pm
Calculated133 pm
Covalent139 pm
Van der Waals206 pm
Ionic radii (Shannon-Prewitt)
+376 pm
Successive ionisation energies
I₁834 kJ/mol
I₂1594.9 kJ/mol
I₃2440 kJ/mol
I₄4260 kJ/mol
I₅5400 kJ/mol
Electron affinity103.2 kJ/mol
Oxidation states
-3-2-10+1+2+3+4+5
Bold states = most common.
Warm-up
Antimony — do you remember?
3 questions on this page. The right answer shows every time, and nothing is asked of you to play.
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