Dubnium (Db) is a synthetic chemical element with atomic number 105, group 5, period 7, and atomic mass 268. The Dubnium (Db) is highly radioactive, and the atomic weight of nine known isotopes range from 255 to 263; the longest-lived isotope, dubnium 268 has an half-life of 32 hours. The Dubnium does not have any application and little is known about it. (Refer to the Chemical Element; Periodic Table)
