Hafnium  Physical & General Properties
Atomic number				72
Atomic weight				178.49
Electronegativity category				Transition metal
Density				13.31  g/cm3
Melting point				2227 ℃
Boiling point				1602 ℃
Thermal Conductivity				0.230 W/cm/K @ 298.2 K
Electrical Resistivity				35.1 microhm-cm @ 25℃
Electronegativity				1.3 Paulings
Specific Heat				0.035 Cal/g/K @ 25 ℃
Heat of Fusion				6.0 Cal/gm mole
Discovered by				D.Coster and George de Hevesy