3D Bohr-model representation of the Technetium atom (symbol Tc, atomic number Z=43). Electron shell configuration: 2, 8, 18, 13, 2 electrons.
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Bohr model · educational
Bohr model of technetium
Technetium (Tc) has 43 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) | 13 |
| O (n = 5) | 2 |
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 4d⁵ 5s²
Short[Kr] 4d⁵ 5s²
Valence electrons7
KLMNOPQ shells
K2
L8
M18
N13
O2
Electronegativity
Pauling1.9
Allen1.51
Mulliken (eV)—
Atomic radii
Empirical135 pm
Calculated183 pm
Covalent147 pm
Van der Waals—
Successive ionisation energies
I₁702 kJ/mol
I₂1470 kJ/mol
I₃2850 kJ/mol
Electron affinity53 kJ/mol
Oxidation states
-3-10+1+2+3+4+5+6+7
Bold states = most common.
Warm-up
Technetium — 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