Hf

HAFNIUM

Definition from 'hafnia' or copenhagen. it closely ressembles zirconium in chemical properties and crystal structure in making xtremely difficult to separate htese two elements.

Discovery 1923 by dirk coster of denmark

Uses nuclear submarines, reactor control rods

Group of Elements Early transition metals(Solid)

Atomic Weight 178.49

Oxidation State +4

Melting Point 2227

Boiling Point 4602

Density 13.1 g/cm3

Electronegativity 1.3