PmZ =  61

From the Greek "Prometheus", meaning "forethought"
(AM) Atomic Mass 145  amu    Oxidation States +3
   (BP) Boiling Point 2460  °C    (MP) Melting Point 1080  °C
   (ρ) Density 7.22  g/cm3    Crystal Structure Hexagonal
   ( χ ) Electronegativity n/a    (AR) Atomic Radius 1.63  Å
   Physical State Artificial (C) Heat Capacity n/a
Electronic-Config [Xe]  4f5  6s2     (I1) First Ionization E 535.88  kJ/mol
   (ΔHvap) Heat of Vaporization 289  kJ/mol     (ΔHfus) Heat of Fusion 7.13  kJ/mol
   Year of Discovery 1945    Location of Discovery United States
(E°) Standard Potential Pm2+⇔ Pm (-2.200 V)
Stable isotopes None. All natural isotopes are radioactive
Discovered/Synthesized by Jacob A. Marinsky, Lawrence E. Glendenin, Charles D. Coryell
Natural Source Promethiumman-made, synthetic
Common Uses Luminous dials, sheet thickness gauges
Other Info Has no stable isotopes
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