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Atom properties
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Van der Waals atomic radius (pm):
209 [8]
Empirical atomic radius (pm):
135 [8]
Covalent atomic radius (pm):
147(7) [8]
Ionic radius (Å):
Tc(VII): 0.56 (6-coordinate) [1]
Tc(V): 0.60 (6-coordinate) [1]
Tc(IV): 0.64 (6-coordinate) [1]
Electronegativity
Pauling Scale:
1.9 [8]
Allen Scale:
1.51 [8]
Electron binding forces
Electron Affinity (eV):
0.55 [8]
Ionization Energy (eV):
7.28 [8]
Electron configuration
Ground state:
1s
2
-2s
2
-2p
6
-3s
2
-3p
6
-3d
10
-4s
2
-4p
6
-4d
6
-5s
1
[8]
