Radium-219 is a radioactive isotope of the element radium, which is part of the alkaline earth metals group in the periodic table. It has a relatively short half-life of about 4.0 seconds, making it highly unstable. This isotope is produced through the decay of actinium-223 and is part of the decay chain of uranium. Due to its rapid decay, radium-219 is not commonly found in nature and has limited practical applications. Its primary significance lies in scientific research, particularly in the study of radioactive decay processes and the behavior of heavy elements in nuclear chemistry.