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 radioactivity, technetium is primarily used in medical applications, particularly in nuclear medicine for imaging and diagnostic procedures. It is often used in radiopharmaceuticals to help visualize organs and tissues in the body. Technetium's properties make it valuable for various industrial applications, including radiography and corrosion studies.