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Name: Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Mass: 140.90765 g
Number of Protons/Electrons: 59
Number of Neutrons: 82
Ionic Radius: Pr3+ / 1.013 Angstrom Pr4+ / 0.90 Angstrom
Metal
Melting Point: 931.0 °C
Boiling Point: 3212.0 °C
Density @ 293 K: 6.773 g/cm3
Oxide
Melting Point: 2415.0 °C
Density cubic C: 5.8719 g/cm3
Formula: Pr6O11
Molecular weight: 1021.45 g
Metal %: 82.75
Toxicity LD 50.PO: (rat) > 1000 mg/kg
Dehydrated Carbonate
Formula *: Pr2(CO3)3
Molecular weight: 461.84 g
Oxide %: 73.7
Anhydrous Chloride
Formula *: PrCl3
Molecular weight: 247.27 g
Oxide %: 68.85
Toxicity LD 50.PO: (mouse) 4500 mg/kg
Anhydrous Fluoride
Formula *: PrF3
Molecular weight: 197.90 g
Oxide %: 86.0
Hydroxide
Formula *: Pr(OH)3
Molecular weight: 191.93 g
Oxide %: 88.7
Dehydrated Nitrate
Formula *: Pr((NO3)3
Molecular weight: 326.92 g
Oxide %: 46.9
Toxicity LD 50.PO: (rat) 3500 mg/kg
Dehydrated Oxalate
Formula *: Pr2(C2O4)3
Molecular weight: 545.88 g
Oxide %: 62.35
Anhydrous sulfate
Formula *: Pr2(SO4)3
Molecular weight: 569.99 g
Oxide %: 59.75
* theoretic data
| Isotope |
Half Life |
| Pr-141 |
Stable |
| Pr-142 |
19.12 hours |
| Pr-143 |
13.57 days |
| Pr-144 |
17.28 minutes |
| Pr-145 |
7.2 minutes |
Date of discovery: 1885
Discoverer: C.F. Aver von Welsbach
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Markets and applications
Electronics:
Ceramics for electronics,
SUPERAMIC™.
Others:
Glass compounds,
Ceramic coloring.
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