Technetium Atomic Number: 43 Atomic Symbol: Tc Atomic Weight: (97) Electron Configuration: -18-13-2 History, Properties and Uses: (Gr. technetos, artificial) Element 43 was predicted on the basis of the periodi c table, and was erroneously reported as having been discovered in 1925, at which time it was named masurium. The element was actually discovered by Perrier and Segre in Italy in 1937. It was found in a sample of molybdenum, which was bombarded by deut erons in the Berkeley cyclotron, and which E. Lawrence sent to these investigators. Technetium was the first element to be produced artificially