ErZ =  68

From the Swedish "Ytterby", meaning "outer village"
(AM) Atomic Mass 167.26  amu    Oxidation States +3
   (BP) Boiling Point 2510  °C    (MP) Melting Point 1522  °C
   (ρ) Density 9.04  g/cm3    Crystal Structure Hexagonal
   ( χ ) Electronegativity 1.2    (AR) Atomic Radius 1.57  Å
   Physical State Solid (C) Heat Capacity 0.168  J/g °C
Electronic-Config [Xe]  4f12  6s2     (I1) First Ionization E 588.65  kJ/mol
   (ΔHvap) Heat of Vaporization 280  kJ/mol     (ΔHfus) Heat of Fusion 19.9  kJ/mol
   Year of Discovery 1842    Location of Discovery Sweden
(E°) Standard Potential Er2+⇔ Er (-2.000 V),   Er3+⇔ Er (-2.331 V)
Stable isotopes  162Er,  164Er,  166Er,  167Er,  168Er,  170Er
Discovered/Synthesized by Carl Gustaf Mosander
Natural Source The mineral/ore gadolinite
Common Uses Fiber optic signal amplifiers, IR lasers, laser surgery, pink glass, sunglasses, vanadium alloys
Other Info One of four elements named after Ytterby, Sweden
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