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{{Infobox element
|number=105
|symbol=Db
|name=dubnium
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[rutherfordium]]
|right=[[seaborgium]]
|above=[[tantalum|Ta]]
|below=(Upe)
|group=5
|period=7
|block=d
|appearance=
|electrons per shell=2, 8, 18, 32, 32, 11, 2
|electrons per shell comment=
|phase=solid
|phase comment=''(predicted)''<ref name=bcc/>
|density gpcm3nrt=21.6
|density gpcm3nrt comment=''(predicted)''<ref name=density>{{cite journal |last1=Gyanchandani |first1=Jyoti |last2=Sikka |first2=S. K. |title=Physical properties of the 6 d -series elements from density functional theory: Close similarity to lighter transition metals |journal=Physical Review B |date=10 May 2011 |volume=83 |issue=17 |pages=172101 |doi=10.1103/PhysRevB.83.172101}}</ref><ref name=kratz>{{cite book |last1=Kratz |last2=Lieser |title=Nuclear and Radiochemistry: Fundamentals and Applications |date=2013 |page=631 |edition=3rd}}</ref>
|crystal structure=body-centered cubic
|crystal structure ref= ''(predicted)''<ref name=bcc>{{cite journal|doi=10.1103/PhysRevB.84.113104|title=First-principles calculation of the structural stability of 6d transition metals|year=2011|last1=Östlin|first1=A.|last2=Vitos|first2=L.|journal=Physical Review B|volume=84|issue=11|bibcode=2011PhRvB..84k3104O }}</ref>
|number of ionization energies=5
|ionization energy 1=665
|ionization energy comment=''(all but first estimated)''<ref name=Haire>{{cite book| title=The Chemistry of the Actinide and Transactinide Elements| editor1-last=Morss|editor1-first=L.R.|editor2-first=N. M.| editor2-last=Edelstein| editor3-last=Fuger|editor3-first=Jean| last1=Hoffman|first1=D. C. |last2=Lee |first2=D. M. |last3=Pershina |first3=V.|chapter=Transactinides and the future elements| publisher= [[Springer Science+Business Media]]| year=2006| isbn=978-1-4020-3555-5| edition=3rd|pages=1652–1752| ref=CITEREFHaire2006}}</ref>
|ionization energy 2=1547
|ionization energy 3=2378
|atomic radius=139
|atomic radius comment=''(estimated)''<ref name=Haire/>
|covalent radius=149
|covalent radius comment=''(estimated)''<ref name=rsc>{{cite web|url=http://www.rsc.org/chemsoc/visualelements/pages/data/dubnium_data.html |title=Dubnium |publisher=[[Royal Chemical Society]] |access-date=October 9, 2017}}</ref>
|CAS number=53850-35-4
|magnetic susceptibility=
|magnetic susceptibility ref=
|isotopes=
{{infobox element/isotopes decay2 | mn=262 | sym=Db | na=[[synthetic radioisotope|syn]] | hl=34 s<ref>{{cite book|last1=Münzenberg|first1=G.|last2=Gupta|first2=M.|chapter=Production and Identification of Transactinide Elements|page=877|year=2011|doi=10.1007/978-1-4419-0720-2_19|title=Handbook of Nuclear Chemistry|publisher=Springer}}</ref><ref name=lifetimes/>
|dm1=67% [[alpha decay|α]] | de1=8.66,<br>8.45 | link1=lawrencium-258 | pn1=258 | ps1=Lr
|dm2=33% [[spontaneous fission|SF]] |de2= |pn2= |ps2=}}
{{infobox element/isotopes decay3 | mn=263 | sym=Db | na=syn | hl=27 s<ref name=lifetimes/>
|dm1=56% SF | de1= | pn1= | ps1=
|dm2=41% α|de2=8.36 | link2=lawrencium-259 | pn2=259 | ps2=Lr
|dm3=3% [[electron capture|ε]] | de3= | pn3=263[[nuclear isomer|m]] | ps3=Rf}}
{{infobox element/isotopes decay2 | mn=266 | sym=Db | na=syn | hl=20 min<ref name=lifetimes/>
|dm1=SF | de1= | pn1=| ps1=
|dm2=ε? | de2= | link2=rutherfordium-266 | pn2=266 | ps2=Rf}}
{{infobox element/isotopes decay2 | mn=267 | sym=Db | na=syn | hl=1.2 h<ref name=lifetimes/> | dm1=SF | de1= | pn1= | ps1= |dm2=ε? |de2= |link2=rutherfordium-267 |pn2=267 |ps2=Rf}}
{{infobox element/isotopes decay3 | mn=268 | sym=Db | na=syn | hl=28 h<ref name=lifetimes>{{cite web |url=http://newscenter.lbl.gov/news-releases/2010/10/26/six-new-isotopes/ |title=Six New Isotopes of the Superheavy Elements Discovered |publisher=Berkeley Lab |date=2010 |access-date=October 9, 2017 |url-status=live |archive-url=https://web.archive.org/web/20140505191355/http://newscenter.lbl.gov/news-releases/2010/10/26/six-new-isotopes/ |archive-date=May 5, 2014 }}</ref>
|dm1=SF | de1= | pn1= | ps1=
|dm2= ε? | de2= | link2=rutherfordium-268 | pn2=268 | ps2=Rf
|dm3= α<ref>http://flerovlab.jinr.ru/index.php/2020/12/25/she-factory-first-experiment/</ref> |de3=7.723 |link3=lawrencium-264 |pn3=264 |ps3=Lr}}
{{infobox element/isotopes decay3 | mn=270 | sym=Db | na=syn | hl=15 h<ref>{{cite journal |last1=Oganessian |first1=Yu. Ts. |last2=Abdullin |first2=F. Sh. |last3=Bailey |first3=P. D. |last4=Benker |first4=D. E. |last5=Bennett |first5=M. E. |last6=Dmitriev |first6=S. N. |last7=Ezold |first7=J. G. |last8=Hamilton |first8=J. H. |last9=Henderson |first9=R. A.  |title=Synthesis of a New Element with Atomic Number ''Z''=117 |date=2010 |journal=Physical Review Letters |publisher=American Physical Society |volume=104  |number=142502 |doi=10.1103/PhysRevLett.104.142502 |pmid=20481935 |bibcode=2010PhRvL.104n2502O |url=https://www.researchgate.net/publication/44610795_Synthesis_of_a_new_element_with_atomic_number_Z__117 |display-authors=3 |url-status=live |archive-url=https://web.archive.org/web/20161018065434/https://www.researchgate.net/publication/44610795_Synthesis_of_a_new_element_with_atomic_number_Z__117 |archive-date=October 18, 2016 }}</ref> | dm1=17% SF | de1= | pn1= | ps1=
|dm2=83% α | de2= | link2=lawrencium-266 | pn2=266 | ps2=Lr
|dm3=ε? |de3= |link3=rutherfordium-270 |pn3=270 |ps3=Rf}}
|naming=after [[Dubna]], [[Moscow Oblast]], Russia, site of [[Joint Institute for Nuclear Research]]
|discovered by=independently by the [[Lawrence Berkeley Laboratory]] and the Joint Institute for Nuclear Research
|discovery date=1970
|QID=Q1232
}}<noinclude>
{{Infobox element/element navigation|symbol=Db}}
{{Template reference list}}
{{documentation|1=Template:Infobox element/doc}}
</noinclude>

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