Praseodymium

Actinium 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 Raoom Temperature: Solid Element Classification: Metal Period Number: 6    Group Number: None    Group Name: Lanthanide