ډوبنيوم

Dubnium,  ₁₀₅Db

عمومي خواص
Pronunciation	/ˈduːbniəm/ DOOB-nee-əm
Dubnium په دوراني جدول کې
Ta ↑ Db ↓ (Upe) rutherfordium ← dubnium → seaborgium ‍
اټومي شمیره (Z)	105
گروپ, پیریود	group 5, period 7
بلاک	d-block
Element category	transition metal
Mass number	268 (most stable isotope)
Electron configuration	[Rn] 5f14 6d3 7s2[۱]
Electrons per shell	2, 8, 18, 32, 32, 11, 2
فزیکي خواص
حالت (at STP)	جامد (predicted)[۲]
Density near r.t.	29.3 g/cm3 (predicted)[۱][۳]
اټومي خواص
Oxidation states	5, (4), (3)[۱][۳] ​(parenthesized oxidation states are predictions)
Ionization energies	1st: 656.1 kJ/mol 2nd: 1546.7 kJ/mol 3rd: 2378.4 kJ/mol (more) (all but first estimated)[۱]
Atomic radius	empirical: 139 pm (estimated)[۱]
Covalent radius	149 pm (estimated)[۴]
Miscellanea
Crystal structure	​body-centered cubic (bcc) (predicted)[۲]
CAS Number	53850-35-4
History
Naming	after Dubna, Moscow Oblast, Russia, site of the Joint Institute for Nuclear Research
Discovery	independently by the University of California and the Joint Institute for Nuclear Research (1970)
Main isotopes of dubnium
آيسو­ټوپ Abun­dance نیم ژوند (t1/2) Decay mode Pro­duct کينډۍ:Infobox element/isotopes decay2 کينډۍ:Infobox element/isotopes decay3 کينډۍ:Infobox element/isotopes decay2 کينډۍ:Infobox element/isotopes decay2 کينډۍ:Infobox element/isotopes decay2 کينډۍ:Infobox element/isotopes decay3
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ډوبنيوم (په انگرېزي: Dubnium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Db سمبول او ۱۰۵ اتمي شمېرې په وسیله ښودل شوی دی.

1. ↑ ^{۱٫۰ ۱٫۱ ۱٫۲ ۱٫۳ ۱٫۴} Hoffman, Darleane C.; Lee, Diana M.; Pershina, Valeria (2006). "Transactinides and the future elements". In Morss; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements (3rd ed.). Dordrecht, The Netherlands: Springer Science+Business Media. ISBN 1-4020-3555-1.
2. ↑ ^{۲٫۰ ۲٫۱} 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. ↑ ^{۳٫۰ ۳٫۱} Fricke, Burkhard (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. نه اخيستل شوی 4 October 2013.
4. ↑ Chemical Data. Dubnium - Db, Royal Chemical Society