Characters: element symbols: Hf, density: 13.2, melting point: 2150.0, boiling point: 5400.0, with a plastic metal impurities in the presence of a qualitative change when hard and brittle. Stable in air, burning only on the surface when the dark. Filaments can ignite the flame of a match. Properties like zirconium. Do not and water, acid or alkali effect, but easy to dissolve in aqua regia and hydrofluoric acid 
 Uses: As it is easy to emit electrons and is useful (for example, as incandescent filament.) For X-ray tube cathode, hafnium and tungsten or molybdenum alloys as high-pressure discharge of the electrode. Hafnium can be used as many inflatable system getter. Hafnium getter to remove oxygen present in the system, nitrogen does not need gas. 
 Elements Uses: 
 Because it is easy to emit electrons and is useful (for example, as incandescent filament.) For X-ray tube cathode, hafnium and tungsten or molybdenum alloys as high-pressure discharge of the electrode. Is used as the cathode and the tungsten X-ray manufacturing industries. Better because of its neutron absorption capacity, so do the nuclear reactor control rods used to slow down the rate of nuclear chain reactions, atomic reactions and suppress the "flame." For the latest intel45 Nano processor.