Tc
Technetium
Z 43 97.0 g/molTransition Metal Radioactive
Nucleus
43 Protons
54 Neutrons
43 Electrons (7 Valence)
Shell distribution: K2 • L8 • M18 • N13 • O2 • P0 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Kr]4d55s2
Oxidation States
CommonRare
0
Pick a state to see its ions
Radii
Empirical
135 pm1.35 Å
Calculated
183 pm1.83 Å
Covalent
147±7 pm1.47±0.07 Å
Van der Waals
209 pm2.09 Å
IonicTc4+
64.5 pm0.645 Å
Crystal Structure
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Hexagonal close-packed
Pearson symbol
hP2
Space group
P63/mmc No. 194