Dubnium, 105 General properties Pronunciation Template:Infobox element/pronunciation Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)Dubnium in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 105 Group Template:Infobox element/group Period period 7 Block d-block Element category Template:Infobox element/category format Electron configuration [Rn ] 5f14 6d3 7s2 [1] Electrons per shell
2, 8, 18, 32, 32, 11, 2 Physical properties Phase at STP solid (predicted) [2] Density (near r.t. ) 29.3 g/cm3 (predicted) [1] [3] Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state [[Ionization energy|Template:Engvar energies]] 1st: 665 kJ/mol 2nd: 1547 kJ/mol 3rd: 2378 kJ/mol (more ) (all but first estimated) [1] Atomic radius empirical: 139 pm (estimated) [1] Covalent radius 149 pm (estimated) [4] Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure (predicted) [2] CAS Number 53850-35-4 History Naming after Dubna , Moscow Oblast , Russia, site of Joint Institute for Nuclear Research Discovery independently by the Lawrence Berkeley Laboratory and the Joint Institute for Nuclear Research (1970) Main isotopes of dubnium Template:Infobox element/isotopes table | references
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↑ 1.0 1.1 1.2 1.3 1.4 Hoffman, D. C.; Lee, D. M.; Pershina, V. (2006). "Transactinides and the future elements". In Morss, L.R.; Edelstein, N. M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Springer Science+Business Media . pp. 1652–1752. ISBN 978-1-4020-3555-5 ↑ 2.0 2.1 Östlin, A.; Vitos, L. (2011). "First-principles calculation of the structural stability of 6d transition metals". Physical Review B . 84 (11). Bibcode :2011PhRvB..84k3104O . doi :10.1103/PhysRevB.84.113104 . ↑ 3.0 3.1 Fricke, B. (1975). "Superheavy elements: a prediction of their chemical and physical properties" . Recent Impact of Physics on Inorganic Chemistry . 21 : 89–144. doi :10.1007/BFb0116498 . Archived from the original on October 4, 2013. Retrieved October 4, 2013 . ↑ "Dubnium" . Royal Chemical Society . Retrieved October 9, 2017 .