Hafnium was discovered by Dirk Coster and George Charles von Hevesy at 1923 in Denmark.
Origin of name: from the Latin name "Hafnia" meaning "Copenhagen".
Atomic Number: 72
Atomic Weight: 178.49
Melting Point: 2506 K (2233°C or 4051°F)
Boiling Point: 4876 K (4603°C or 8317°F)
Density: 13.3 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number: 6 Group Number: 4 Group Name: none