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Dubnium
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Dubnium is a synthetic chemical element with the symbol Db and atomic number 105. It is highly radioactive: the most stable known isotope, dubnium-268, has a half-life of about 28 hours. This greatly limits extended research on the element.
#Dubnium #PeriodicTable #Mendeleev
#Dubnium #PeriodicTable #Mendeleev
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