![](//upload.wikimedia.org/wikipedia/commons/thumb/7/71/Rhenium_single_crystal_bar_and_1cm3_cube.jpg/220px-Rhenium_single_crystal_bar_and_1cm3_cube.jpg) |
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Pronunciation | (REE-nee-əm) |
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Appearance | silvery-grayish |
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| 186.207(1)[1] |
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Atomic number (Z) | 75 |
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Group | group 7 |
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Period | period 6 |
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Block | d-block |
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Electron configuration | [Xe] 4f14 5d5 6s2 |
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Electrons per shell | 2, 8, 18, 32, 13, 2 |
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Phase at STP | solid |
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Melting point | 3459 K (3186 °C, 5767 °F) |
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Boiling point | 5903 K (5630 °C, 10,170 °F) |
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Density (near r.t.) | 21.02 g/cm3 |
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when liquid (at m.p.) | 18.9 g/cm3 |
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Heat of fusion | 60.43 kJ/mol |
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Heat of vaporization | 704 kJ/mol |
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Molar heat capacity | 25.48 J/(mol·K) |
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Vapor pressure
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
3303 |
3614 |
4009 |
4500 |
5127 |
5954 |
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Oxidation states | −3, −1, 0, +1, +2, +3, +4, +5, +6, +7 (a mildly acidic oxide) |
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Electronegativity | Pauling scale: 1.9 |
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Ionization energies | - 1st: 760 kJ/mol
- 2nd: 1260 kJ/mol
- 3rd: 2510 kJ/mol
- (more)
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Atomic radius | empirical: 137 pm |
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Covalent radius | 151±7 pm |
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Spectral lines of rhenium |
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Natural occurrence | primordial |
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Crystal structure | hexagonal close-packed (hcp) |
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Speed of sound thin rod | 4700 m/s (at 20 °C) |
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Thermal expansion | 6.2 µm/(m⋅K) |
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Thermal conductivity | 48.0 W/(m⋅K) |
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Electrical resistivity | 193 nΩ⋅m (at 20 °C) |
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Magnetic ordering | paramagnetic[2] |
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Molar magnetic susceptibility | +67.6×10−6 cm3/mol (293 K)[3] |
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Young's modulus | 463 GPa |
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Shear modulus | 178 GPa |
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Bulk modulus | 370 GPa |
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Poisson ratio | 0.30 |
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Mohs hardness | 7.0 |
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Vickers hardness | 1350–7850 MPa |
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Brinell hardness | 1320–2500 MPa |
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CAS Number | 7440-15-5 |
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Naming | after the river Rhine (German: Rhein) |
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Discovery | Walter Noddack, Ida Noddack, Otto Berg (1925) |
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First isolation | Walter Noddack, Ida Noddack (1928) |
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Category: Rhenium | references |