The Elements (07Nov00):

unnilseptium
Symbol:
Atomic number: 107
Atomic weight: (262)
Radioactive transition metal. Half-life of approximately 1/500 s.
Discovered by the Joint Institute for Nuclear Research at Dubna
(U.S.S.R.)
in 1976. Confirmed by West German physicists at the Heavy Ion Research
Laboratory at Darmstadt.