Technetium is produced mostly as a synthetic element with very little existing in the earths crust. If it occurs naturally it is from spontaneous fission products in uranium and thorium ores. Technetium’s properties were predicted by Mendeleev before it was discovered when he noted the gap in the periodic table. In 1925 Ida Tacke, Walter Noddack and Otto Berg analysed platinum and columbite ores in hope of discovering element 43. After a series of X-ray analysis they published evidence claiming to have discovered element 43. Whilst this evidence was received skeptically it was replicated in a study in 1999. Credit for the discovery of Technetium is is given to Carlo Perrier and Emilio Segre who bombarded a sample of Molyndenum with deuterium nuceli and found several Technetium isotopes made synthetically. Uses of Technetium 99 is a stable isotope and emits gamma rays and can me used by gamma camera for diagnosis in hospitals. It is located in Group 7 as a Transition metal. It has a melting point of 2157°c and a boiling point of 4265°c.
Carlo Perrier, Émillo Segrè