Dubnium is a chemical element that belongs to the group of transition metals. It is a highly radioactive element that was first discovered in 1968 by a team of scientists. Dubnium is named after the city of Dubna in Russia, where it was discovered. Apart from dubnium, this element is also known by other names like unnilpentium and element 105. In the periodic table, dubnium is represented by the symbol Db. It is found in extremely small quantities in nature and is mostly produced artificially in nuclear reactors. Due to its rarity and high radioactivity, dubnium is not used for any practical applications.