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Name: Europium
Symbol: Eu
Atomic Number: 63
Atomic Mass: 151.964 g
Number of Protons/Electrons: 63
Number of Neutrons: 89
Ionic Radius: Eu2+ / 1.09 Angstrom
Eu3+ / 0.950 Angstrom
Metal
Melting Point: 822.0 °C
Boiling Point: 1597.0 °C
Density @ 293 K: 5.234 g/cm3
Oxide
Melting Point: 2050.0 °C
Density cubic C: 7.2867 g/cm3
Formula: Eu2O3
Molecular weight: 483.95 g
Metal %: 72.7
Toxicity LD 50.PO: (rat) > 1000 mg/kg
Dehydrated Carbonate
Formula *: Eu2(CO3)3
Molecular weight: 483.95 g
Oxide %: 72.7
Anhydrous Chloride
Formula *: EuCl3
Molecular weight: 258.32 g
Oxide %: 68.1
Toxicity LD 50.PO: (mouse) 5000 mg/kg
Anhydrous Fluoride
Formula *: EuF3
Molecular weight: 208.96 g
Oxide %: 84.2
Hydroxide
Formula *: Eu(OH)3
Molecular weight: 202.98 g
Oxide %: 86.7
Dehydrated Nitrate
Formula *: Eu(NO3)3
Molecular weight: 337.97 g
Oxide %: 52.05
Toxicity LD 50.PO: (rat) 5000 mg/kg
Dehydrated Oxalate
Formula *: Eu2(C2O4)3
Molecular weight: 567.98 g
Oxide %: 61.95
Anhydrous sulfate
Formula *: Eu2(SO4)3
Molecular weight: 592.09 g
Oxide %: 59.45
* theoretic data
| Isotope |
Half Life |
| Eu-147 |
24.4 days |
| Eu-148 |
54.5 days |
| Eu-149 |
93.1 days |
| Eu-150 |
36.0 years |
| Eu-151 |
Stable |
| Eu-152 |
13.5 years |
| Eu-152m |
9.3 hours |
| Eu-153 |
Stable |
| Eu-154 |
8.6 years |
| Eu-155 |
7.4 years |
| Eu-156 |
15.2 days |
Date of discovery: 1901
Discoverer: Eugene Demarcay
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Markets and applications
Electronics:
Three band lamps,
Cathode ray tubes (CRT),
Flat plasma TV screen,
Phosphors.
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