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The rewards and challenges of expanding the periodic table, by Hiromitsu Haba

Since its conception by Dmitri Mendeleev in 1869, the periodic table has grown and evolved. In my school days, the table ended with element 103, lawrencium. Now, 118 elements fit perfectly in its seven familiar rows. But how far will it go? How many elements will we be able to create—and how will the periodic table expand to accommodate them? Today, transactinide elements (those with an atomic number greater than or equal to 104) are typically called superheavy elements. These species have been artificially synthesized in heavy-ion-induced nuclear fusion reactions. A projectile nucleus is accelerated to about 10% of the speed of light and aimed at a target nucleus in the hopes that they will fuse together in a new heavy atom. Because the probability that the nuclei will fuse together is extremely low, scientists have to run synthesis experiments for weeks or even months to generate only one new