89Ac227
Actinium
ActinidesBlock fPeriod 7solid at 20 °C
Configuration :[Rn] 6d¹ 7s²
Atomic mass :227 u
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Modèle de Bohr · pédagogique
Electron configuration
Full[Rn] 6d¹ 7s²
Short[Rn] 6d¹ 7s²
Valence electrons3
KLMNOPQ shells
K2
L8
M18
N32
O18
P9
Q2
Electronegativity
Pauling1.1
Allen—
Mulliken (eV)—
Atomic radii
Empirical195 pm
Calculated—
Covalent215 pm
Van der Waals—
Ionic radii (Shannon-Prewitt)
+3112 pm
Successive ionisation energies
I₁499 kJ/mol
I₂1170 kJ/mol
Electron affinity—
Oxidation states
+3
Bold states = most common.