Dubnium

Dubnium is an artificially produced radioactive element. The atomic weight of nine known isotopes range from 255 to 263; the longest-lived isotope, dubnium 268 has a half-life of 32 hours. Dubnium is very unstable and little is known about it.

Dubnium
Properties
Atomic symbol	Db
Atomic number	105
Classification	Transition metal
Atomic mass	262 amu
Other Information
Date of discovery	1970
Name of discoverer	Albert Ghiorso
Name origin	After Dubna, Russia.
Uses	Dubnium has no known uses.
Obtained from	Man-made.