Transactinide elements are a group of synthetic elements in the periodic table with atomic numbers greater than 103. They are located in the f-block and include elements such as Berkelium, Californium, and Einsteinium. These elements are typically unstable and radioactive, with very short half-lives, making them difficult to study. These elements are created in laboratories through nuclear reactions, often involving the collision of lighter atomic nuclei. Due to their instability, transactinide elements have limited practical applications, but they are important for research in nuclear chemistry and physics, helping scientists understand the properties of heavy elements.