Rhenium, 75Re
 |
| General properties |
| Name, seembol |
rhenium, Re |
| Appearance |
sillery-white |
| Pronunciation |
REE-nee-əm |
| Rhenium in the periodic cairt |
|
|
| Atomic nummer (Z) |
75 |
| Group, block |
group 7, d-block |
| Period |
period 6 |
| Element category |
transeetion metal |
| Staundart atomic wicht (Ar) |
186.207 |
| Electron configuration |
[Xe] 4f14 5d5 6s2 |
|
per shell
|
2, 8, 18, 32, 13, 2 |
| Pheesical properties |
| Phase |
solid |
| Meltin pynt |
3459 K (3186 °C, 5767 °F) |
| Bylin pynt |
5869 K (5596 °C, 10105 °F) |
| Density near r.t. |
21.02 g/cm3 |
| when liquid, at m.p. |
18.9 g/cm3 |
| Heat o fusion |
60.43 kJ/mol |
| Heat o vapourisation |
704 kJ/mol |
| Molar heat capacity |
25.48 J/(mol·K) |
vapour pressur
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
3303 |
3614 |
4009 |
4500 |
5127 |
5954 |
|
| Atomic properties |
| Oxidation states |
7, 6, 5, 4, 3, 2, 1, 0, -1
(mildly acidic oxide) |
| Electronegativity |
Pauling scale: 1.9 |
| Ionisation energies |
(mair) |
| Atomic radius |
empirical: 137 pm |
| Covalent radius |
151±7 pm |
| Miscellanea |
| Creestal structur |
hexagonal close-packed (hcp)
|
| Speed o soond thin rod |
4700 m/s (at 20 °C) |
| Thermal expansion |
6.2 µm/(m·K) |
| Thermal conductivity |
48.0 W/(m·K) |
| Electrical resistivity |
193 n Ω·m (at 20 °C) |
| Magnetic orderin |
paramagnetic[1] |
| Young's modulus |
463 GPa |
| Shear modulus |
178 GPa |
| Bouk modulus |
370 GPa |
| Poisson ratio |
0.30 |
| Mohs haurdness |
7.0 |
| Vickers haurdness |
2450 MPa |
| Brinell haurdness |
1320 MPa |
| CAS Nummer |
7440-15-5 |
| History |
| Diskivery |
Masataka Ogawa (1908) |
| First isolation |
Masataka Ogawa (1908) |
| Named bi |
Walter Noddack, Ida Noddack, Otto Berg (1922) |
| Maist stable isotopes o rhenium |
|
|
| Decay modes in parentheses are predictit, but hae nae yet been observed |
|
· references |
Rhenium is a chemical element wi the seembol Re an atomic nummer 75. It is a sillery-white, hivy, third-row transeetion metal in group 7 o the periodic table. Wi an estimatit average concentration o 1 pairt per billion (ppb), rhenium is ane o the rarest elements in the Yird's crust. The free element haes the third-heichest meltin pynt an heichest boilin pynt o ony element. Rhenium resembles manganese chemically an is obtained as a bi-product o molybdenum an copper ore's extraction an refinement. Rhenium shaws in its compoonds a wide variety o oxidation states rangin frae −1 tae +7.
