Interactive OnLine Periodic Table
- Click on the Atomic Symbol to see the Atomic
Weight, number, history & physical description. Includes CAS, density, crystal structure,
% purity, and particle size for each product AEE Website Table of Contents
Physical, Chemical Properties & Notes for Element:
HAFNIUM
Atomic Symbol - Hf
Atomic weight - 178.49
Atomic number - 72
Electron configuration - 2-8-18-32-10-2
Oxidation states - +4
State of matter - solid
Heavy metal-ductile
Discovered in 1923 by Dirk Coster and George Charles de Hevesy
Boils at 5400 °C, melts at 2150 °C
Background Notes:
Chemically similar to zirconium (40), hafnium is used for nuclear
control rods.