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Lutetium |
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Pronunciation | (lew-TEE-shee-əm) |
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Appearance | silvery white |
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Standard atomic weight Ar, std(Lu) | 7002174966800000000♠174.9668(1)[1] |
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Lutetium in the periodic cairt |
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Y ↑ Lu ↓ Lr |
ytterbium ← lutetium → hafnium |
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Atomic nummer (Z) | 71 |
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Group | group n/a |
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Period | period 6 |
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Block | d-block |
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Element category | Lanthanide |
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Electron confeeguration | [Xe] 4f14 5d1 6s2 |
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Electrons per shell | 2, 8, 18, 32, 9, 2 |
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Pheesical properties |
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Phase at STP | solit |
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Meltin pynt | 1925 K (1652 °C, 3006 °F) |
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Bylin pynt | 3675 K (3402 °C, 6156 °F) |
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Density (near r.t.) | 9.841 g/cm3 |
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when liquid (at m.p.) | 9.3 g/cm3 |
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Heat o fusion | ca. 22 kJ/mol |
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Heat o vapourisation | 414 kJ/mol |
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Molar heat capacity | 26.86 J/(mol·K) |
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Vapour pressur
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
1906 |
2103 |
2346 |
(2653) |
(3072) |
(3663) |
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Atomic properties |
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Oxidation states | 0,[2] +1, +2, +3 waikly basic |
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Electronegativity | Pauling scale: 1.27 |
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Atomic radius | empirical: 174 pm |
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Covalent radius | 187±8 pm |
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Spectral lines o lutetium |
Ither properties |
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Naitural occurrence | primordial |
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Creestal structur | hexagonal close-packed (hcp) |
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Thermal expansion | (r.t.) (poly) 9.9 µm/(m·K) |
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Thermal conductivity | 16.4 W/(m·K) |
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Electrical resistivity | (r.t.) (poly) 582 n Ω·m |
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Magnetic orderin | paramagnetic[3] |
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Young's modulus | 68.6 GPa |
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Shear modulus | 27.2 GPa |
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Bulk modulus | 47.6 GPa |
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Poisson ratio | 0.261 |
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Vickers haurdness | 1160 MPa |
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Brinell haurdness | 893 MPa |
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CAS Nummer | 7439-94-3 |
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History |
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Diskivery | Georges Urbain an Carl Auer von Welsbach (1906) |
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First isolation | Carl Auer von Welsbach (1906) |
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Main isotopes o lutetium |
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Isotope |
Abundance |
Hauf-life (t1/2) |
Decay mode |
Product |
173Lu |
syn |
1.37 y |
ε |
173Yb |
174Lu |
syn |
3.31 y |
ε |
174Yb |
175Lu |
97.41% |
- |
(α) |
171Tm |
176Lu |
2.59% |
3.78×1010 y |
β− |
176Hf |
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Decay modes in parentheses are predictit, but hae nae yet been observed |
| references |