What element did Carlo Perrier and Emilio Segre discover together?
Carlo Perrier: Carlo Perrier (7 July 1886 – 22 May 1948) was an Italian mineralogist who did extensive research on the element technetium in 1936. Carlo Perrier:  He discovered the element along with his colleague, Emilio Segrè (1905-1989), in 1937. Emilio Segrè: Emilio Gino Segrè (1 February 1905 – 22 April 1989) was an Italian physicist and Nobel laureate who discovered the elements technetium and astatine, and the antiproton, a sub-atomic antiparticle, for which he was awarded the Nobel Prize in Physics in 1959.
the element technetium