|
|
| Technetium | |
| Electron Configuration | 2,8,18,13,2 |
| Electron Configuration | [Kr] 4d5 5s2 |
| Ground state | 6S5/2 |
| Atomic Volume | 8.5 g/cm3 |
| 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. |
| Electrical Properties |
|
| Electrical resistivity | No data. |
| Electrical conductivity | No data. |
| Chemical Properties |
|
| Electrochemical Equivalent | 0.51651 g Ah-1 |
| Valence Electron Potential (-eV) | 180 |
| Ionization Potential | |
 First
|
7.28 |
| Second
|
15.26 |
| Third
|
29.54 |
| Energy Levels |
|
| Kα1 (intensity 100) |
18.3671 KeV |
| Kα2 (intensity 50) |
18.2508 KeV |
| Kβ1 (intensity 17.4) |
20.619 KeV |
| Kβ2 (intensity 3.8) |
21.0015 KeV |
| Kβ3 (intensity 8) |
20.5947 KeV |
| Lα1 (intensity 100) |
2.424 KeV |
| Lβ1 (intensity 45) |
2.5368 KeV |
| Lβ3 (intensity 4.5) |
2.6149 KeV |
| Lβ4 (intensity 4) |
2.5963 KeV |
| Lγ3 (intensity 2) |
2.249 KeV |
| Ll (intensity 4.5) |
2.1296 KeV |
| Atomic Radii |
|
| Empirical
|
135 pm |
| Bohr Radius
|
183 pm |
| Covalent Radius
|
156 pm |
| Van der Waals
|
No data. |
| Triple covalent
|
110 pm |
| Metallic
|
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 |
|
| Main
|
Tc+4, Tc+5, Tc+7 |
| Other
|
Tc-1, Tc0, Tc+6 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
702 |
| M+ - M2+ |
1472 |
| M2+ - M3+ |
2850 |
| M3+ - M4+ |
4100 |
| M4+ - M5+ |
5700 |
| M5+ - M6+ |
7300 |
| M6+ - M7+ |
9100 |
| M7+ - M8+ |
15600 |
| M8+ - M9+ |
17800 |
| M9+ - M10+ |
19900 |
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 2727 | 2998 | 3324 | 3726 | 4234 | 4894 |
| Crystal Structure |
|
| Structure
|
Hexagonal close packed |
 |
a = 273.5 pm |
| b = 273.5 pm | |
| c = 438.8 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |