In 1937 Carlo Perrier & Emilio Segre filled in no. 43 on this table, the first entry to be artificially produced
... Technetium was the first element to be produced artificially and all 
its ... Technetium does not occur naturally in the biosphere and so normally never
... [DOC] [TLE] technetium (Tc) | chemical element | Britannica.com [PAR] atomic number, 43 ... produced technetium, the first element that does not occur 
in nature to be made artificially.