Terbium

Actinium Atomic Number: 65 Atomic Weight: 158.92535 Melting Point: 1629 K (1356°C or 2473°F) Boiling Point: 3503 K (3230°C or 5846°F) Density: 8.23 grams per cubic centimeter Phase at Raoom Temperature: Solid Element Classification: Metal Period Number: 6    Group Number: None    Group Name: Lanthanide