Praseodymium was discovered by Carl F. Auer von Welsbach at 1885 in Austria.
Origin of name: from the Greek words "prasios didymos" meaning "green twin"
Atomic Number: 59
Atomic Weight: 140.90765
Melting Point: 1204 K (931°C or 1708°F)
Boiling Point: 3793 K (3520°C or 6368°F)
Density: 6.77 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 6 Group Number: none Group Name: Lanthanide