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Rhenium |
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Pronunciation | (REE-nee-əm) |
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Appearance | sillery-white |
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Standard atomic weight Ar, std(Re) | 7002186207000000000♠186.207(1)[1] |
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Rhenium in the periodic cairt |
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Atomic nummer (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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Element category | Transeetion metal |
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Electron confeeguration | [Xe] 4f14 5d5 6s2 |
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Electrons per shell | 2, 8, 18, 32, 13, 2 |
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Pheesical properties |
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Phase at STP | solit |
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Meltin pynt | 3459 K (3186 °C, 5767 °F) |
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Bylin pynt | 5869 K (5596 °C, 10105 °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 o fusion | 60.43 kJ/mol |
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Heat o vapourisation | 704 kJ/mol |
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Molar heat capacity | 25.48 J/(mol·K) |
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Vapour pressur
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
3303 |
3614 |
4009 |
4500 |
5127 |
5954 |
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Atomic properties |
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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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Ionisation energies | |
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Atomic radius | empirical: 137 pm |
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Covalent radius | 151±7 pm |
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Spectral lines o rhenium |
Ither properties |
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Naitural occurrence | primordial |
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Creestal structur | hexagonal close-packed (hcp) |
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Speed o soond 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 n Ω·m (at 20 °C) |
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Magnetic orderin | paramagnetic[2] |
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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 haurdness | 7.0 |
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Vickers haurdness | 2450 MPa |
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Brinell haurdness | 1320 MPa |
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CAS Nummer | 7440-15-5 |
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History |
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Diskivery | Masataka Ogawa (1908) |
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First isolation | Masataka Ogawa (1908) |
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Named by | Walter Noddack, Ida Noddack, Otto Berg (1922) |
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Main isotopes o rhenium |
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Decay modes in parentheses are predictit, but hae nae yet been observed |
| references |