3D Bohr-model representation of the Boron atom (symbol B, atomic number Z=5). Electron shell configuration: 2, 3 electrons.
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Bohr model · educational
Bohr model of boron
Boron (B) has 5 electrons, spread over 2 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) | 3 |
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
Orbital hybridization
sp, sp², sp³, sp³d, sp³d²: geometries, examples (methane, benzene, SF₆). σ and π overlap.
14 minElectron configuration
Full1s² 2s² 2p¹
Short[He] 2s² 2p¹
Valence electrons3
KLMNOPQ shells
K2
L3
Electronegativity
Pauling2.04
Allen2.051
Mulliken (eV)—
Atomic radii
Empirical85 pm
Calculated87 pm
Covalent84 pm
Van der Waals192 pm
Ionic radii (Shannon-Prewitt)
+327 pm
Successive ionisation energies
I₁800.6 kJ/mol
I₂2427.1 kJ/mol
I₃3659.7 kJ/mol
I₄25025.8 kJ/mol
I₅32826.7 kJ/mol
Electron affinity26.7 kJ/mol
Oxidation states
-5-10+1+2+3
Bold states = most common.
Warm-up
Boron — 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