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Pronunciation | (dis-PROH-zee-əm) |
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Appearance | silvery white |
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| 162.500(1)[1] |
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Atomic number (Z) | 66 |
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Group | f-block groups (no number) |
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Period | period 6 |
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Block | f-block |
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Electron configuration | [Xe] 4f10 6s2 |
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Electrons per shell | 2, 8, 18, 28, 8, 2 |
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Phase at STP | solid |
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Melting point | 1680 K (1407 °C, 2565 °F) |
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Boiling point | 2840 K (2562 °C, 4653 °F) |
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Density (near r.t.) | 8.540 g/cm3 |
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when liquid (at m.p.) | 8.37 g/cm3 |
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Heat of fusion | 11.06 kJ/mol |
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Heat of vaporization | 280 kJ/mol |
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Molar heat capacity | 27.7 J/(mol·K) |
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Vapor pressure
P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
at T (K) |
1378 |
1523 |
(1704) |
(1954) |
(2304) |
(2831) |
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Oxidation states | 0,[2] +1, +2, +3, +4 (a weakly basic oxide) |
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Electronegativity | Pauling scale: 1.22 |
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Ionization energies | - 1st: 573.0 kJ/mol
- 2nd: 1130 kJ/mol
- 3rd: 2200 kJ/mol
-
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Atomic radius | empirical: 178 pm |
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Covalent radius | 192±7 pm |
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Spectral lines of dysprosium |
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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 | 2710 m/s (at 20 °C) |
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Thermal expansion | α, poly: 9.9 µm/(m⋅K) (r.t.) |
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Thermal conductivity | 10.7 W/(m⋅K) |
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Electrical resistivity | α, poly: 926 nΩ⋅m (r.t.) |
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Magnetic ordering | paramagnetic at 300 K |
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Molar magnetic susceptibility | +103500×10−6 cm3/mol (293.2 K)[3] |
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Young's modulus | α form: 61.4 GPa |
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Shear modulus | α form: 24.7 GPa |
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Bulk modulus | α form: 40.5 GPa |
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Poisson ratio | α form: 0.247 |
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Vickers hardness | 410–550 MPa |
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Brinell hardness | 500–1050 MPa |
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CAS Number | 7429-91-6 |
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Discovery | Lecoq de Boisbaudran (1886) |
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First isolation | Georges Urbain (1905) |
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Main isotopes[4] |
Decay |
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abundance |
half-life (t1/2) |
mode |
product |
154Dy |
synth |
3.0×106 y |
α |
150Gd |
156Dy |
0.056% |
stable |
158Dy |
0.095% |
stable |
160Dy |
2.33% |
stable |
161Dy |
18.9% |
stable |
162Dy |
25.5% |
stable |
163Dy |
24.9% |
stable |
164Dy |
28.3% |
stable |
165Dy |
synth |
2.334 h |
β− |
165Ho |
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Category: Dysprosium | references |