The Actinide Series consists of 15 chemical elements in the periodic table, ranging from atomic number 89 (Actinium) to 103 (Lawrencium). These elements are all radioactive and are known for their complex electron configurations. They are typically found in nature in trace amounts and are primarily used in nuclear energy and weapons. Most actinides are metals with similar properties, including high density and melting points. The series includes well-known elements like Uranium and Plutonium, which are crucial for nuclear reactors and atomic bombs. Due to their radioactivity, handling actinides requires special safety precautions.