3D Bohr-model representation of the Chromium atom (symbol Cr, atomic number Z=24). Electron shell configuration: 2, 8, 13, 1 electrons.
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Bohr model · educational
Bohr model of chromium
Chromium (Cr) has 24 electrons, spread over 4 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) | 13 |
| N (n = 4) | 1 |
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
Electron configuration
Filling rules (Aufbau, Pauli, Hund), notations like [Ar] 4s² 3d⁶, valence electrons. Iron, copper, transition metal cases.
12 minElectron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s¹
Short[Ar] 3d⁵ 4s¹
Valence electrons6
KLMNOPQ shells
K2
L8
M13
N1
Electronegativity
Pauling1.66
Allen1.65
Mulliken (eV)—
Atomic radii
Empirical140 pm
Calculated166 pm
Covalent139 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+361.5 pm
+644 pm
Successive ionisation energies
I₁652.9 kJ/mol
I₂1590.6 kJ/mol
I₃2987 kJ/mol
I₄4743 kJ/mol
I₅6702 kJ/mol
Electron affinity64.3 kJ/mol
Oxidation states
-4-2-10+1+2+3+4+5+6
Bold states = most common.
Warm-up
Chromium — do you remember?
3 questions on this page. The right answer shows every time, and nothing is asked of you to play.
No account · one minute