Francium-223 is a highly radioactive isotope of the element francium, which is part of the alkali metals group in the periodic table. It has a very short half-life of about 22 minutes, making it one of the least stable elements. Due to its rarity and instability, francium-223 is not found in significant amounts in nature and is typically produced in laboratories. This isotope decays primarily through alpha decay, transforming into radium-219. Because of its extreme radioactivity, francium-223 has limited practical applications and is mainly of interest for scientific research in nuclear chemistry and physics.