|
|
| Rhenium | |
| Electron Configuration | 2,8,18,32,13,2 |
| Electron Configuration | [Xe] 4f14 5d5 6s2 |
| Ground state | 6S5/2 |
| Atomic Volume | 8.85 g/cm3 |
| Electronegativity | 1.9 |
| Magnetic ordering | No data |
| Mass magnetic susceptibility | 4.6 x 10-9 |
| Molar magnetic susceptibility | 8.57 x 10-10 |
| Speed of sound | 4700 m s-1 |
 Thermal Properties |
|
| Enthalpy of Atomization | 791 kJ mol-1 @25°C |
| Enthalpy of Fusion | 33.1 kJ mol-1 |
| Enthalpy of Vaporisation | 704.25 kJ mol-1 |
| Heat Capacity | 25.48 J mol-1 K-1 |
| Thermal Conductivity | 48.0 W m-1 K-1 |
| Thermal Expansion | 6.2 μm m-1 K-1 |
| Hardness |
|
| Brinell hardness | 1320 MPa |
| Mohs hardness | 7.0 |
| Vickers hardness | 2450 MPa |
| Elastic Properties |
|
| Bulk modulus | 370 GPa |
| Poisson ratio | 0.30 |
| Shear modulus | 178 GPa |
| Young's modulus | 463 GPa |
| Electrical Properties |
|
| Electrical resistivity | 1.8 x 10-7 Ω m |
| Electrical conductivity | No data. |
| Chemical Properties |
|
| Electrochemical Equivalent | 0.9924 g Ah-1 |
| Electron Work Function | 4.96 eV |
| Valence Electron Potential (-eV) | 180 |
| Ionization Potential | |
 First
|
7.88 |
| Energy Levels |
|
| Kα1 (intensity 100) |
61.1403 KeV |
| Kα2 (intensity 50) |
59.7179 KeV |
| Kβ1 (intensity 25.9) |
69.31 KeV |
| Kβ2 (intensity 10.3) |
70.1682 KeV |
| Kβ3 (intensity 10.1) |
69.2571 KeV |
| Lα1 (intensity 100) |
8.6525 KeV |
| Lα2 (intensity 10) |
8.5862 KeV |
| Lβ1 (intensity 41) |
10.01 KeV |
| Lβ2 (intensity 19) |
10.2752 KeV |
| Lβ3 (intensity 6.5) |
10.1581 KeV |
| Lβ4 (intensity 4) |
9.8455 KeV |
| Lγ1 (intensity 6) |
11.6854 KeV |
| Lγ2 (intensity 2) |
12.0078 KeV |
| Lγ3 (intensity 2) |
9.024 KeV |
| Ll (intensity 4.5) |
7.6013 KeV |
| Atomic Radii |
|
| Empirical
|
135 pm |
| Bohr Radius
|
188 pm |
| Covalent Radius
|
159 pm |
| Van der Waals
|
No data. |
| Triple covalent
|
110 pm |
| Metallic
|
137 pm |
| Ionic Radii (Å) |
||||
| Charge | Coordination | Crystal | Ionic | Key |
| 4 | Vi | 0.77 | 0.63 | RM |
| 5 | VI | 0.72 | 0.58 | E |
| 6 | VI | 0.69 | 0.55 | E |
| 7 | IV | 0.52 | 0.38 | |
| VI | 0.67 | 0.53 | ||
| 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
|
Re+3, Re+4, Re+5 |
| Other
|
Re-3, Re-1, Re0, Re+1, Re+2, Re+6, Re+7 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
760 |
| M+ - M2+ |
1260 |
| M2+ - M3+ |
2510 |
| M3+ - M4+ |
3640 |
| M4+ - M5+ |
4900 |
| M5+ - M6+ |
6300 |
| M6+ - M7+ |
7600 |
| Vapour Pressure |
||||||
| P (Pa) | 1 | 10 | 100 | 1K | 10K | 100K |
| T (K) | 3303 | 3614 | 4009 | 4500 | 5127 | 5954 |
| Crystal Structure |
|
| Structure
|
Hexagonal close packed |
 |
a = 276.1 pm |
| b = 276.1 pm | |
| c = 445.6 pm | |
| α = 90° | |
| β = 90° | |
| γ = 120° | |