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{{Infobox element
|engvar={{{engvar|}}}
|number=108
|symbol=Hs
|name=hassium
|mass number comment=(data not decisive){{efn|name="most stable isotope"|The most stable isotope of hassium cannot be determined based on existing data due to uncertainty that arises from the low number of measurements. The [[confidence interval]] of half-life of 269Hs corresponding to one [[standard deviation]] is, based on existing data, {{val|16|6}} seconds, whereas that of 270Hs is {{val|9|4}} seconds. It is also possible that 277mHs is more stable than both of these, with its half-life likely being {{val|110|70}} seconds, but only one event of decay of this isotope has been registered {{as of|2016|lc=y}}.<ref>{{Cite web|title=Radioactive Elements|url=https://ciaaw.org/radioactive-elements.htm|date=2018|access-date=2020-09-20|website=[[Commission on Isotopic Abundances and Atomic Weights]]|language=en}}</ref>{{sfn|Audi|2017|p=030001-136}}}}
|abundance=
|abundance in earth's crust=
|abundance in oceans=
|abundance in solar system=
|left=[[bohrium]]
|right=[[meitnerium]]
|above=[[osmium|Os]]
|below=(Uhb)
|group=8
|period=7
|block=d
|appearance=
|electrons per shell=2, 8, 18, 32, 32, 14, 2
|electrons per shell comment=
|phase=solid
|phase comment=''(predicted)''<ref name=Oestlin/>
|density gpcm3nrt=27–29
|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=hexagonal close-packed
|crystal structure comment=''(predicted)''<ref name=Oestlin>{{cite thesis |last=Östlin |first=A. |date=2013 |title=Electronic Structure Studies and Method Development for Complex Materials |type=Licentiate |chapter=Transition metals |pages=15–16 |url=https://www.diva-portal.org/smash/get/diva2:606386/FULLTEXT01.pdf |access-date=24 October 2019}}</ref>
|number of ionization energies=8
|ionization energy comment=''(predicted)''{{sfn|Hoffman|2006|p=1673}}
|ionization energy 1=730
|ionization energy 2=1760
|ionization energy 3=2830
|atomic radius=126
|atomic radius comment=''(estimated)''{{sfn|Hoffman|2006|p=1691}}
|covalent radius=134
|covalent radius comment=''(estimated)''<ref name=rsc>{{cite web |url=http://www.rsc.org/periodic-table/element/108/hassium |title=Chemical Data: Hassium |last1=Robertson |first1=M. |date=2011 |work=Visual Elements Periodic Table |publisher=[[Royal Society of Chemistry]] |access-date=28 November 2012}}</ref>
|CAS number=54037-57-9
|magnetic susceptibility=
|magnetic susceptibility ref=
|isotopes=
{{infobox element/isotopes decay | mn=269 | sym=Hs | na=syn | hl=16 s | dm=[[alpha decay|α]] | de=9.21, 9.10, 8.97 | link1=Isotopes of seaborgium | pn=265 | ps=Sg}}
{{infobox element/isotopes decay | mn=270 | sym=Hs | na=syn | hl=9 s | dm=α | de=9.02, 8.88 | link1= | pn=266 | ps=Sg}}
{{infobox element/isotopes decay | mn=277m | sym=Hs | na=syn | hl=110 s | dm=SF | de= | link1= | pn= | ps=}}

|naming=after {{lang|la|Hassia}}, Latin for [[Hesse]], Germany, where it was discovered<ref name="Emsley2011">{{cite book|last=Emsley|first=J.|title=Nature's Building Blocks: An A–Z Guide to the Elements|edition=New|year=2011|publisher=Oxford University Press|isbn=978-0-19-960563-7|pages=215–217}}</ref>
|discovered by=[[Gesellschaft für Schwerionenforschung]]
|discovery date=1984
|QID=Q1252
}}<noinclude>
{{Infobox element/element navigation|symbol=Hs}}
{{Template reference list|lower-alpha}}
{{documentation|1=Template:Infobox element/doc}}
</noinclude>

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