Praseodymium (Pr) is a chemical element of the periodic table, located in the period 6, and has the atomic number 59. It is the third element in the lanthanide series. It is a soft, malleable, ductile, grayish-white metal, whose name comes from the Greek word “prasios didymos”, which means green twin. It is counted as one of the rare earth elements.
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| – f block |
FAQs on Praseodymium Element
| Praseodymium |
|---|
| ‣ What does praseodymium look like? Appearance: greyish white |
| ‣ Who discovered praseodymium? When was praseodymium discovered? Discovery: Carl Auer von Welsbach (1885) |
‣ Location of praseodymium on the periodic table Location: Praseodymium is found in the sixth row of the periodic table, next to the cerium element. |
| ‣ What is praseodymium atomic mass number? Atomic number (Z): 59 |
| ‣ What is praseodymium symbol? Symbol: Pr |
| ‣ What is the atomic weight for praseodymium? Standard atomic weight: 140.90766 |
| ‣ What is the block of praseodymium? Block: f-block |
| ‣ What period is praseodymium on the periodic table? Period: 6 |
| ‣ Praseodymium atomic radius: empirical: 182 pm |
| ‣ Praseodymium covalent radius: 203±7 pm |
| ‣ What is the melting point of praseodymium? Melting point: 1208 K (935 °C, 1715 °F) |
| ‣ Praseodymium boiling point: 3403 K (3130 °C, 5666 °F) |
| ‣ How many shells does praseodymium have? Electrons per shell: 2, 8, 18, 21, 8, 2 |
| ‣ What is the electron configuration of praseodymium? Electron configuration: [Xe] 4f3 6s2 |
| ‣ Praseodymium ionization energies: 1st: 527 kJ/mol 2nd: 1020 kJ/mol 3rd: 2086 kJ/mol |
| ‣ Is praseodymium solid, liquid or gas at room temperature? Phase (at r.t): solid |
| ‣ What is praseodymium density? Density (near r.t): 6.77 g/cm3 when liquid (at m.p): 6.50 g/cm3 |
| ‣ Praseodymium magnetic ordering: paramagnetic |
| ‣ Praseodymium natural occurrence: primordial |
| ‣ What is the oxidation state of praseodymium? Oxidation state: +3, +4 |
| ‣ What’s the electronegativity of praseodymium? Electronegativity: Pauling scale: 1.13 |
| ‣ Praseodymium poisson’s ratio: α form: 0.281 |
| ‣ Praseodymium heat of fusion: 6.89 kJ/mol |
| ‣ Praseodymium heat of vaporization: 331 kJ/mol |
| ‣ Praseodymium molar heat capacity: 27.20 J/(mol K) |
| ‣ Praseodymium molar magnetic susceptibility: +5010.0 × 10-6 cm3/mol (293 K) |
| ‣ Speed of sound in praseodymium: 2280 m/s (at 20 °C) |
| ‣ What is the crystal structure of praseodymium? Crystal structure: double hexagonal close-packed (dhcp) |
| ‣ Thermal expansion of praseodymium: α, poly: 6.7 µm/(m.K) (at r.t) |
| ‣ Thermal conductivity of praseodymium: 12.5 W/(m.K) |
| ‣ Praseodymium electrical resistivity: α, poly: 0.700 nΩ.m (at r.t) |
| ‣ Praseodymium hardness Vickers hardness: 250-745 MPa Brinell hardness: 250-640 MPa |
| ‣ Young’s modulus of praseodymium: α form: 37.3 GPa |
| ‣ Shear modulus of praseodymium: α form: 14.8 GPa |
| ‣ Bulk modulus of praseodymium: α form: 28.8 GPa |
| ‣ Praseodymium CAS number: 7440-10-0 |
‣ Praseodymium vapor pressure
| Vapor pressure | ||||||
|---|---|---|---|---|---|---|
| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| at T (K) | 1771 | 1973 | (2227) | (2571) | (3054) | (3779) |
‣ How many isotopes does praseodymium have?
| Main isotopes of praseodymium | ||||
|---|---|---|---|---|
| Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
| 141Pr | 100 % | stable | ||
| 142Pr | syn | 19.12 h | β– ε | 142Nd 142Ce |
| 143Pr | syn | 13.57 d | β– | 143Nd |
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