Latest revision as of 18:10, 11 November 2018
Praseodymium, 59Pr |
| General properties |
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| Pronunciation | Template:Infobox element/pronunciation |
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| Appearance | grayish white |
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| Standard atomic weight (Ar, standard) | Template:Infobox element/standard atomic weight |
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| Mass number | Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope) |
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| Praseodymium in the periodic table |
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| Template:Infobox element/periodic table |
| Atomic number (Z) | 59 |
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| Group | Template:Infobox element/group |
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| Period | period 6 |
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| Block | f-block |
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| Element category | Template:Infobox element/category format |
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| Electron configuration | [Xe] 4f3 6s2 |
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Electrons per shell | 2, 8, 18, 21, 8, 2 |
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| Physical properties |
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| Phase at STP | solid |
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| Melting point | 1208 K (935 °C, 1715 °F) |
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| Boiling point | 3403 K (3130 °C, 5666 °F) |
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| Density (near r.t.) | 6.77 g/cm3 |
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| when liquid (at m.p.) | 6.50 g/cm3 |
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| Heat of fusion | 6.89 kJ/mol |
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| [[Enthalpy of vaporization|Heat of Template:Engvar]] | 331 kJ/mol |
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| Molar heat capacity | 27.20 J/(mol·K) |
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| [[Vapor pressure|Template:Engvar pressure]] |
| Atomic properties |
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| Oxidation states | Template:Infobox element/symbol-to-oxidation-state |
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| Electronegativity | Pauling scale: 1.13 |
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| [[Ionization energy|Template:Engvar energies]] | - 1st: 527 kJ/mol
- 2nd: 1020 kJ/mol
- 3rd: 2086 kJ/mol
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| Atomic radius | empirical: 182 pm |
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| Covalent radius | 203±7 pm |
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| Template:Infobox element/spectral lines |
| Other properties |
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| Crystal structure | Template:Infobox element/crystal structure |
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| Speed of sound thin rod | 2280 m/s (at 20 °C) |
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| Thermal expansion | α, poly: 6.7 µm/(m·K) (at r.t.) |
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| Thermal conductivity | 12.5 W/(m·K) |
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| Electrical resistivity | α, poly: 0.700 µΩ·m (at r.t.) |
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| Magnetic ordering | paramagnetic[1] |
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| Magnetic susceptibility | +5010.0·10−6 cm3/mol (293 K)[2] |
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| Young's modulus | α form: 37.3 GPa |
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| Shear modulus | α form: 14.8 GPa |
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| Bulk modulus | α form: 28.8 GPa |
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| Poisson ratio | α form: 0.281 |
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| Vickers hardness | 250–745 MPa |
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| Brinell hardness | 250–640 MPa |
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| CAS Number | 7440-10-0 |
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| History |
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| Discovery | Carl Auer von Welsbach (1885) |
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| Main isotopes of praseodymium |
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| Template:Infobox element/isotopes table |
| | references |
Template:Infobox element/element navigation
Template:Template reference list
Expression error: Unrecognized word "template".
- ↑ Jackson, M. (2000). "Magnetism of Rare Earth" (PDF). The IRM quarterly. 10 (3): 1.
- ↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.
