In 1937 Carlo Perrier & Emilio Segre filled in no. 43 on this table, the first entry to be artificially produced
... 
with his discovery of the antiproton, discovered the first of the elements produced 
by ... After the discovery of artificial radioactivity by Irne and Frdric Joliot-Curie
, ... which filled the empty space in the periodic table at atomic number 43, using 
a... [DOC] [TLE] Technetium - Chemicool [PAR] It was discovered in 1937 by Carlo Perrier and Emilio Segr.