First artificially produced element

Technetium (Tc) was discovered in 1937 by
Carlo Perrier and Emilio Segrè (both ITA)
at the University of Palermo in Sicily, Italy.
They isolated the element from a sample of
molybdenum (Mo), which had been exposed to
high levels of radiation in a particle accelerator
known as a cyclotron. Its most stable isotope,
technetium-98, has a half-life of around
4.2 million years, meaning that any significant
mineral deposits in the Earth’s crust have long
since radioactively decayed into ruthenium-98