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Name: Erbium
Symbol: Er
Atomic Number: 68
Atomic Mass: 167.26 g
Number of Protons/Electrons: 68
Number of Neutrons: 99
Ionic Radius: Er3+ / 0.881 Angstrom
Metal
Melting Point: 1522.0 °C
Boiling Point: 1727.0 °C
Density @ 293 K: 9.056 g/cm3
Oxide
Melting Point: 2355.0 °C
Density cubic C: 8.6593 g/cm3
Formula: Er2O3
Molecular weight: 382.52 g
Metal %: 87.45
Toxicity LD 50.PO: (rat) > 1000 mg/kg
Dehydrated Carbonate
Formula *: Er2(CO3)3
Molecular weight: 514.55 g
Oxide %: 74.35
Anhydrous Chloride
Formula *: ErCl3
Molecular weight: 273.62 g
Oxide %: 69.9
Toxicity LD 50.PO: (mouse) > 6200 mg/kg
Anhydrous Fluoride
Formula *: ErF3
Molecular weight: 224.26 g
Oxide %: 85.3
Hydroxide
Formula *: Er(OH)3
Molecular weight: 218.28 g
Oxide %: 87.6
Dehydrated Nitrate
Formula *: Er(NO3)3
Molecular weight: 352.27 g
Oxide %: 54.3
Dehydrated Oxalate
Formula *: Er2(C2O4)3
Molecular weight: 598.58 g
Oxide %: 63.9
Anhydrous sulfate
Formula *: Er2(SO4)3
Molecular weight: 622.69 g
Oxide %: 61.45
* theoretic data
| Isotope |
Half Life |
| Er-162 |
Stable |
| Er-164 |
Stable |
| Er-166 |
Stable |
| Er-167 |
Stable |
| Er-168 |
Stable |
| Er-169 |
9.4 days |
| Er-170 |
Stable |
| Er-171 |
7.5 hours |
| Dy-172 |
2.1 days |
Date of discovery: 1843
Discoverer: Carl Mosander
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Markets and applications
Electronics:
Nuclear reactors,
Ceramics
Others:
Glass coloring,
Optic fiber,
Medical application,
Laser.
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