T.B. Coplen J.K. Böhlke M.E. Wieser G. Singleton T. Walczyk S. Yoneda P.G. Mahaffy L.V. Tarbox N.E. Holden 2011 For almost 150 years, the Periodic Table of the Elements has served as a guide to the world of elements by highlighting similarities and differences in atomic structure and chemical properties. To introduce students, teachers, and society to the existence and importance of isotopes of the chemical elements, an IUPAC Periodic Table of the Isotopes (IPTI) has been prepared and can be found as a supplement to this issue. application/pdf en IUPAC IUPAC Periodic Table of the Isotopes article