What is trans-neptium?

Trans-neptunium refers to elements in the Periodic Table that are heavier than uranium (element 92) and are typically found beyond neptunium (element 93). These elements, including plutonium and americium, are often synthesized in laboratories and are primarily radioactive. They are part of the actinide series, and their properties and behaviors are of great interest in nuclear chemistry and physics. Due to their instability and rarity, trans-neptunium elements have limited practical applications but are significant in research and nuclear technology.