N
a synthetic transactinide element produced in minute quantities by bombarding plutonium with high-energy neon ions. Symbol: Du; atomic no 105 杜(元素)
→see
hahnium
Berkelium (Bk), Dubnium (Db), andHassium (Hs) werenamed afterBerkeley, CA, Dubna, Russia and the German state ofHessen, respectively, where theseman-madeelements were created.