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Name:Lanthanum
Symbol: La
Atomic Number: 57
Atomic Mass: 138.9055 g
Number of Protons/Electrons: 57
Number of Neutrons: 82
Ionic Radius: La3+ / 1.061 Angstrom
Metal
Melting Point: 920.0 °C
Boiling Point: 3454.0 °C
Density @ 293 K: 6.670 g/cm3
Oxide
Melting Point: 2250.0 °C
Density cubic C: 5.8719 g/cm3
Formula: La2O3
Molecular weight: 325.82 g
Metal %: 85.25
Toxicity LD 50.PO: (rat) > 10000 mg/kg
Dehydrated Carbonate
Formula *: La2(CO3)3
Molecular weight: 457.84 g
Oxide %: 71.15
Anhydrous Chloride
Formula *: LaCl3
Molecular weight: 245.26 g
Oxide %: 66.4
Toxicity LD 50.PO: (rat) 4200 mg/kg
Anhydrous Fluoride
Formula *: LaF3
Molecular weight: 195.90 g
Oxide %: 83.15
Hydroxide
Formula *: La(OH)3
Molecular weight: 189.93 g
Oxide %: 85.75
Dehydrated Nitrate
Formula *: La(NO3)3
Molecular weight: 324.92 g
Oxide %: 50.15
Toxicity LD 50.PO: (rat) 4500 mg/kg
Dehydrated Oxalate
Formula *: La2(C2O4)3
Molecular weight: 541.87 g
Oxide %: 60.1
Anhydrous sulfate
Formula *: La2(SO4)3
Molecular weight: 565.98 g
Oxide %: 57.55
* theoretic data
| Isotope |
Half Life |
| La-134 |
6.5 minutes |
| La-137 |
6000.0 years |
| La-138 |
1.05E10 years |
| La-139 |
Stable |
| La-140 |
1.67 days |
| La-141 |
3.9 hours |
| La-142 |
1.54 minutes |
Date of discovery: 1839
Discoverer: Carl Mosander
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Markets and applications
Electronics:
Three band lamps,
Glass,
Medical imaging,
Ceramics for electronics,
SUPERAMIC™.
Catalysis:
Automotive emissions control :
ACTALYS™,
EOLYS™,
Fuel Cells
Others:
X rays,
Phosphors,
Coloration pigments.
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