Periodic Table of Younger Chemists. Co-sponsored by the International Younger Chemists Network (IYCN) @IUPAC #IUPAC100 #YoungerChemists. In celebration of the 100 th anniversary of IUPAC and the International Year of the Periodic Table, IUPAC and IYCN announce the creation of a Periodic Table of Younger Chemists. Beginning in July 2018 and ending in July 2019 at the World Chemistry Congress …