Which element was the first to be synthesized artificially?

Technetium was the first element to be artificially synthesized, with its production confirmed in 1937. It is element 43, a radioactive metal that had been predicted decades earlier but could not be found in ordinary terrestrial minerals in noticeable amounts.

Dmitri Mendeleev had identified a gap between molybdenum and ruthenium and provisionally called the missing element “eka-manganese.” Carlo Perrier and Emilio Segrè confirmed it after examining radioactive molybdenum produced in a cyclotron. They named the element technetium from the Greek technetos, meaning “artificial.”

Technetium is not completely absent from nature: tiny quantities can form through uranium fission, thorium decay, or neutron reactions in minerals. However, all practical supplies are produced artificially. Its metastable isotope technetium-99m is especially important in nuclear medicine, where its gamma rays help doctors image organs, bones, and blood flow.