Figure 1. Number of neutrons versus number of protons for (i) stable isotopes belonging to the so-called “band of stability” (green symbols) and (ii) superheavy elements of the “island of stability” (blue symbols), predicted time ago. The vertical red bar points out the maximum predicted value of Z = 137. The dashed black line corresponds to number of neutrons = number of protons

From

How Many Chemical Elements are there in the Universe? A (not so) Bohring Question

E. Garrone, C.O. Areán, B. Bonelli

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