Date of Discovery: 1885
Discoverer: C.F. Aver von Welsbach
Name Origin: From the Greek words prasios (green) and didymos (twin)
Uses: Coloring glass and ceramics
Obtained From: Salts

 
Atomic Number: 59
Atomic Mass: 140.90765 amu
Melting Point: 935.0 °C (1208.15 °K, 1715.0 °F)
Boiling Point: 3127.0 °C (3400.15 °K, 5660.6 °F)
Crystal Structure: Hexagonal
Density @ 293 K: 6.77 g/cm3
Color: Unknown

 
Isotope
Pr-141
Pr-142
Pr-143
Pr-144
Pr-145
Half Life
Stable
19.12 hours
13.57 days
17.28 min
7.2 min