| Technetium | |
| Electrons per shell | 2,8,18,13,2 |
| Electron Configuration | [Kr] 4d5 5s2 ![]() |
| Ground state | 6S5/2 |
| Atomic Volume | 8.5 cm3 mol-1 |
| Electronegativity | 1.9 |
| Magnetic ordering | No data |
| Mass magnetic susceptibility | 3.42 x 10-8 |
| Molar magnetic susceptibility | 3.352 x 10-9 |
Thermal Properties |
|
| Enthalpy of Atomization | 649 kJ mol-1 @25°C |
| Enthalpy of Fusion | 23.81 kJ mol-1 |
| Enthalpy of Vaporisation | 585.22 kJ mol-1 |
| Heat Capacity | 24.27 J mol-1 K-1 |
| Thermal Conductivity | No data. |
| Thermal Expansion | No data. |
| Critcal Temperature | No data. |
| Critcal Pressure | No data. |
| Adiabatic index | No data. |
Electrical Properties |
|
| Electrical resistivity | No data. |
| Electrical conductivity | 0.067 106/cm Ω |
Chemical Properties |
|
| Electrochemical Equivalent | 0.51651 g Ah-1 |
| Valence Electron Potential (-eV) | 180 |
| Ionization Potential | |
| 7.28 | |
| 15.26 | |
| 29.54 | |
Energy Levels |
|
| 18.3671 KeV | |
| 18.2508 KeV | |
| 20.619 KeV | |
| 21.0015 KeV | |
| 20.5947 KeV | |
| 2.424 KeV | |
| 2.5368 KeV | |
| 2.6149 KeV | |
| 2.5963 KeV | |
| 2.249 KeV | |
| 2.1296 KeV | |
Atomic Radii |
|
| 135 pm | |
| 183 pm | |
| 156 pm | |
| No data. | |
| 110 pm | |
| 136 pm | |
Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 4 | VI | 0.785 | 0.645 | RM |
| 5 | VI | 0.74 | 0.6 | ER |
| 7 | IV | 0.51 | 0.37 | |
| VI | 0.7 | 0.56 | A | |
| R, From r3 vs V plots. |
| C, Calculated from bond length - bond strength equations. |
| E, Estimated. |
| *, Most Reliable. |
| M, From Metallic Oxides. |
| A, Ahrens (1952) Ionic radius. |
| P, Pauling's (1960) Crystal Radius. |
Oxidation States |
|
| Tc+4, Tc+5, Tc+7 | |
| Tc-1, Tc0, Tc+6 | |
Ionisation Energies (kJ mol-1) ![]() |
|
| 702 | |
| 1472 | |
| 2850 | |
| 4100 | |
| 5700 | |
| 7300 | |
| 9100 | |
| 15600 | |
| 17800 | |
| 19900 | |
Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 2727 | 2998 | 3324 | 3726 | 4234 | 4894 |
Crystal Structure |
|
| Hexagonal close packed | |
![]() |
a = 273.5 pm |
| b = 273.5 pm | |
| c = 438.8 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |