In 1937 Carlo Perrier & Emilio Segre filled in no. 43 on this table, the first entry to be artificially produced
... 
Only one other such element, promethium , is followed (in the periodic table) by ... 
isotope) became the first predominantly artificial element to be produced, hence 
its name ... at the University of Palermo in Sicily by Carlo Perrier and Emilio 
Segr.