The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. In this process a filament (a piece of metal in a vacuum) is heated by the application of electrical current. The heat (energy) is transferred to the \'free\' electrons of the metal which allow some electrons to escape from the surface. After a short period of operation the filament has lost enough electrons to give it an overall charge of 1.100 × 10-6 C. How many electrons, ne, has the filament lost? If the filament is 1.55 g of tungsten, what fraction of electrons, ef, does this represent?