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93Np237
Neptunium
ActinidesBlock fPeriod 7solid at 20 °C
- Configuration :
- [Rn] 5f⁴ 6d¹ 7s²
- Atomic mass :
- 237 u
3D Bohr-model representation of the Neptunium atom (symbol Np, atomic number Z=93). Electron shell configuration: 2, 8, 18, 32, 22, 9, 2 electrons.
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Bohr model · educational
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f⁴ 6d¹ 7s²
Short[Rn] 5f⁴ 6d¹ 7s²
Valence electrons7
KLMNOPQ shells
K2
L8
M18
N32
O22
P9
Q2
Electronegativity
Pauling1.36
Allen—
Mulliken (eV)—
Atomic radii
Empirical175 pm
Calculated—
Covalent190 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+575 pm
Successive ionisation energies
I₁604.5 kJ/mol
Electron affinity—
Oxidation states
+3+4+5+6+7
Bold states = most common.