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Name Dubnium
Atomic Number 105
Atomic Weight [268]
Symbol Db
Melting Point ( °C ) {{{mp}}}
Boiling Point ( °C ) {{{bp}}}
Density (g/cm3) 29.3gcm−3 (predicted)[1][3](at 0 °C, 101.325 kPa)
Earth crust (%) {{{ec}}}
Discovery (Year) Joint Institute for Nuclear Research (1968)
Group transition metal, group 5, block d
Electron configuration [Rn] 5f14 6d3 7s2(predicted)[1]
Ionization energy (eV) 1st: 664.8 kJ·mol−1

2nd: 1546.7 kJ·mol−1 3rd: 2378.4 kJ·mol−1 (more) (all estimated)[1]



Dubnium named after the town of Dubna in Russia, where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.[8]


Unknown extension tag "references"

1. http://en.wikipedia.org/wiki/Dubnium

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