Technetium is a chemical element with the symbol Tc and atomic number 43. It is a silvery-gray metal that is part of the transition metals group in the periodic table. Technetium is unique because it is the first element to be artificially produced, discovered in 1937 by Carlo Perrier and Emilio Segrè. It has no stable isotopes, and its most common isotope, technetium-98, is radioactive. Due to its properties, technetium is primarily used in the field of nuclear medicine. It is often employed in medical imaging, particularly in radiopharmaceuticals for diagnostic scans. Technetium-99m, a metastable isotope, is widely used in various imaging techniques, allowing doctors to visualize organs and detect diseases effectively.