Answer:
Technetium is a chemical element with the symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive, none of which are stable other than the fully ionized state of 97Tc. Nearly all available technetium is produced as a synthetic element.
it is the first element to be prepared that does not occur naturally on the earth, technetium, was created by bombardment of molybdenum by deuterons (heavy hydrogen, 21H\) 1 2 H \) , by Emilio Segre and Carlo Perrier in 1937: 21H+9742Mo⟶210n+9743Tc.