Heavy elements are chemical elements with a high atomic mass, typically defined as those with an atomic number greater than 92, which is the atomic number of uranium. These elements are often found at the bottom of the periodic table and include lead, gold, and plutonium. They tend to have complex atomic structures and can exhibit unique physical and chemical properties. Many heavy elements are radioactive, meaning they can decay over time and emit radiation. This property makes them important in various fields, including nuclear energy and medicine. For example, plutonium is used in nuclear reactors, while gold is valued for its conductivity and resistance to corrosion.