Table of nuclides

Each point plotted on the graph thus represents a nuclide of a known or hypothetical chemical element.

This representation was first published by Kurt Guggenheimer in 1934[2] and expanded by Giorgio Fea in 1935,[3] Emilio Segrè in 1945 or Glenn Seaborg.

In 1958, Walter Seelmann-Eggebert and Gerda Pfennig published the first edition of the Karlsruhe Nuclide Chart.

The unitized table allows easy visualizion of proton/neutron-count trends but requires simultaneous horizontal and vertical scrolling.

The segmented tables permit easier examination of a particular chemical element with much less scrolling.

Isotope half-lives. The darker more stable isotope region departs from the line of protons ( Z ) = neutrons ( N ), as the element number Z becomes larger
Fragment of table of nuclides as seen on a monument in front of University of Warsaw 's Centre of New Technologies, with the four elements named by or for Polish scientists shown in the title ("including Po , Ra , Cm , Cn ") and below the table:
polonium ( 84 Po) discovered in 1898,
radium ( 88 Ra) discovered in 1898,
curium ( 96 Cm) discovered in 1944,
copernicium ( 112 Cn) discovered in 1996.