Actinium
Atom properties
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Van der Waals atomic radius (pm):
260 [6]
Empirical atomic radius (pm):
195 [6]
Covalent atomic radius (pm):
215 [6]
Ionic radius (Å):
1.12 (6-coordinate) [1]
Electronegativity
Pauling Scale:
1.1 [6]
Allen Scale:
Electron binding forces
Electron Affinity (eV):
Ionization Energy (eV):
5.17 [6]
Electron configuration
Ground state:
1s
2
-2s
2
-2p
6
-3s
2
-3p
6
-3d
10
-4s
2
-4p
6
-4d
10
-4f
14
-5s
2
-5p
6
-5d
10
-6s
2
-6p
6
-6d
1
-7s
2
[6]
