Periodic Table of the Elements

Ekkehard Fluck is the former head of the Gmelin Institute for Inorganic Chemistry (Frankfurt, Germany). He is also a long-time member of the International Council for Science as well as other multi-national scientific organizations.

Klaus Heumann is the former Professor of Analytical Chemistry at the University of Mainz (Germany). He is a long-time member of the IUPAC commission on isotope abundances and atomic weights, in which capacity he is actively involved in shaping the IUPAC recommendations on chemical element data.