LaZ =  57

From the Greek "lanthanein", meaning "to lie hidden"
(AM) Atomic Mass 138.9055  amu    Oxidation States +3
   (BP) Boiling Point 3454  °C    (MP) Melting Point 920  °C
   (ρ) Density 6.16  g/cm3    Crystal Structure Hexagonal
   ( χ ) Electronegativity 1.1    (AR) Atomic Radius 1.69  Å
   Physical State Solid (C) Heat Capacity 0.195  J/g °C
Electronic-Config [Xe]  5d1  6s2     (I1) First Ionization E 538.39  kJ/mol
   (ΔHvap) Heat of Vaporization 402.1  kJ/mol     (ΔHfus) Heat of Fusion 6.2  kJ/mol
   Year of Discovery 1839    Location of Discovery Sweden
(E°) Standard Potential La3+⇔ La (-2.379 V)
Stable isotopes  139La
Discovered/Synthesized by Carl Gustaf Mosander
Natural Source The mineral/ore bastnasite, monazite, loparite
Common Uses Optical glass, telescope eyepieces, camera lenses, lighter flints, arc lamps
Other Info Used for anodes of nickel-metal hydride batteries
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