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100Fm257
Fermium
ActinidesBlock fPeriod 7solid at 20 °C
Configuration :[Rn] 5f¹² 7s²
Atomic mass :257 u
3D Bohr-model representation of the Fermium atom (symbol Fm, atomic number Z=100). Electron shell configuration: 2, 8, 18, 32, 30, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Rn] 5f¹² 7s²
Short[Rn] 5f¹² 7s²
Valence electrons14
KLMNOPQ shells
K2
L8
M18
N32
O30
P8
Q2
Electronegativity
Pauling1.3
Allen—
Mulliken (eV)—
Atomic radii
Empirical—
Calculated—
Covalent—
Van der Waals—
Successive ionisation energies
I₁627 kJ/mol
Electron affinity—
Oxidation states
+2+3
Bold states = most common.