Dubnium
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Dubnium is a chemical element. It has been named eka-tantalum, hahnium and unnilpentium but is now named dubnium. It has the symbol Db. It has the atomic number 105. It is a very radioactive element that does not exist in nature. It has to be made. The isotope that has the longest half life only has a half life of 32 hours. This is not a long time but it is longer than the chemical elements that surround it on the periodic table.
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