Thorium was discovered by Jöns Berzelius at 1829 in Sweden.
Origin of name: named after "Thor", the mythological Scandinavian god of war.
Atomic Number: 90
Atomic Weight: 232.03806
Melting Point: 2023 K (1750°C or 3182°F)
Boiling Point: 5061 K (4788°C or 8650°F)
ensity: 11.72 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 7 Group Number: none Group Name: Actinide