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Symbol Db. A radioactive transactinide element; a.n. 105. It was first reported in 1967 by a group at Dubna near Moscow and was confirmed in 1970 at Dubna and at Berkeley, California. It can be made by bombarding californium–249 nuclei with nitrogen–15 nuclei. Only a few atoms have ever been made.

http://www.webelements.com/webelements/elements/text/Db/key.htm Information from the WebElements site

Subjects: Chemistry — Physics.

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