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95Am243
Americium
ActinidesBlock fPeriod 7solid at 20 °C
Configuration :[Rn] 5f⁷ 7s²
Atomic mass :243 u
French :Américium
3D Bohr-model representation of the Americium atom (symbol Am, atomic number Z=95). Electron shell configuration: 2, 8, 18, 32, 25, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Rn] 5f⁷ 7s²
Short[Rn] 5f⁷ 7s²
Valence electrons9
KLMNOPQ shells
K2
L8
M18
N32
O25
P8
Q2
Electronegativity
Pauling1.13
Allen—
Mulliken (eV)—
Atomic radii
Empirical175 pm
Calculated—
Covalent180 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+397.5 pm
Successive ionisation energies
I₁578 kJ/mol
Electron affinity—
Oxidation states
+2+3+4+5+6+7+8
Bold states = most common.