Metals
- Elements List
- Aluminium, Al
- Antimony, Sb
- Arsenic, As
- Barium, Ba
- Beryllium, Be
- Bismuth, Bi
- Boron, B
- Cadmium, Cd
- Calcium, Ca
- Carbon, C (Graphite)
- Cerium, Ce
- Cesium, Cs
- Chromium, Cr
- Cobalt, Co
- Copper, Cu
- Dysprosium, Dy
- Erbium, Er
- Europium, Eu
- Gadolinium, Gd
- Gallium, Ga
- Germanium, Ge
- Gold, Au
- Hafnium, Hf
- Holmium, Ho
- Indium, In
- Iridium, Ir
- Iron, Fe
- Lanthanum, La
- Lead, Pb
- Lithium, Li
- Lutetium, Lu
- Magnesium, Mg
- Manganese, Mn
- Mercury, Hg
- Molybdenum, Mo
- Neodymium, Nd
- Nickel, Ni
- Niobium, Nb
- Osmium, Os
- Palladium, Pd
- Phosphorus, P
- Platinum, Pt
- Potassium, K
- Praseodymium, Pr
- Rhenium, Re
- Rhodium, Rh
- Rubidium, Rb
- Ruthenium, Ru
- Samarium, Sm
- Scandium, Sc
- Selenium, Se
- Silicon, Si
- Silver, Ag
- Sodium, Na
- Strontium, Sr
- Sulphur, S
- Tantalum, Ta
- Tellurium, Te
- Terbium, Tb
- Thallium, Tl
- Thorium, Th
- Thulium, Tm
- Tin, Sn
- Titanium, Ti
- Tungsten, W
- Vanadium, V
- Ytterbium, Yb
- Yttrium, Y
- Zinc, Zn
- Zirconium, Zr
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Praseodymium, Pr
Description
Praseodymium is a chemical element that has the symbol Pr and atomic number 59.
Praseodymium is a soft silvery metal in the lanthanide group. It is somewhat more resistant to corrosion in air than europium, lanthanum, cerium, or neodymium, but it does develop a green oxide coating that spalls off when exposed to air, exposing more metal to oxidation. For this reason, praseodymium should be stored under a light mineral oil or sealed in glass.
Available Forms:
| Technical Data | ||||||||
| Symbol | Pr | Density (25°C)/gcm3 | 6.475 | |||||
| Atomic number | 59 | Melting point / °C | 935 | |||||
| No. of naturally occurring isotopes | 1 | Boiling point / °C | -3020 | |||||
| Atomic weight | 140.9077 | ΔHfus/kJmol-1 | 11.3(+/-2.1) | |||||
| Outer electron configuration | 4f36s2 | ΔHvap/kJmol-1 | 331 | |||||
| Metal radius(6-coordinate)/pm | 182.4 | ΔHf(monoatomic gas)/kJmol-1 | 356 | |||||
| Ionic radius(6-coordinate)/pm IV | 85 | ΔH(hydration Ln3+)/kJmol-1 | 3413 | |||||
| Ionic radius(6-coordinate)/pm III | 99 | Ionization energy/kJmol-1 I | 522 | |||||
| Eo(M4+(aq)+e- → M3+(aq))/V | 2.860* | Ionization energy/kJmol-1 II | 1018 | |||||
| Eo(M3+(aq)+e- → M(s))/V | -2.462 | Ionization energy/kJmol-1 III | 2090 | |||||
| Electrical resistivity (25 oC) μohm cm | 68 | |||||||
| Evaporation Techniques | ||||||||
| Temperature (oC) @Vap. Pressure | Techniques | Remarks | ||||||
| 10-8 Torr | 10-6 Torr | 10-4 Torr | Electron Beam | Crucible | Coil | Boat | ||
| 800 | 950 | 1150 | Good | - | - | Tantalum | Go to Evaporation Sources Page | |
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