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Actinium Ac

Actinium is the element that begins the actinide series in the periodic table. These elements occupy a region where nuclear structure and radioactivity dominate their behavior. Actinium and the other actinides are connected to some of the most extreme processes in astrophysics. Many of these heavy nuclei originate from rapid neutron capture events, such as supernova explosions and neutron-star mergers, where the universe forges its heaviest elements. On planets like Earth, actinium also appears within long radioactive decay chains from heavier elements. These decay processes release energy and contribute to radiogenic heating inside planetary interiors. In this series we explore the periodic table one element at a time, connecting chemistry, physics, and cosmology to understand how the universe builds matter.