{"snapshot":"v2026.Q2","element":{"$schemaVersion":"element-v0","recordRevision":"2026-10-13","atomicNumber":80,"symbol":"Hg","name":{"en":"Mercury","es":null,"fr":null,"de":null,"zh":null,"pt":null,"ja":null},"cas":null,"group":12,"period":6,"block":"d","category":"transition-metal","atomicMass":{"value":200.59,"unit":"u","uncertainty":null,"conditions":null,"sourceRef":"pubchem-periodic-table"},"density":{"value":13.5336,"unit":"g/cm^3","uncertainty":null,"conditions":null,"sourceRef":"pubchem-periodic-table"},"meltingPoint":{"value":234.32,"unit":"K","uncertainty":null,"conditions":null,"sourceRef":"pubchem-periodic-table"},"boilingPoint":{"value":629.88,"unit":"K","uncertainty":null,"conditions":null,"sourceRef":"pubchem-periodic-table"},"electronegativity":{"value":2,"unit":"Pauling","uncertainty":null,"conditions":null,"sourceRef":"pubchem-periodic-table"},"ionizationEnergies":[{"value":1007.1,"unit":"kJ/mol","uncertainty":null,"conditions":null,"sourceRef":"pubchem-periodic-table"}],"electronAffinity":null,"electronConfiguration":{"shorthand":"[Xe] 4f14 5d10 6s2","expanded":null,"shells":null},"termSymbol":null,"oxidationStates":{"common":[2,1],"all":null},"commonCompounds":null,"reactivityNotes":null,"isotopes":[{"massNumber":170,"symbol":"170Hg","mass":{"value":170.00581860903458,"unit":"u","uncertainty":0.000322,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":310,"unit":"us","uncertainty":250},"decayModes":[{"mode":"alpha","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":171,"symbol":"171Hg","mass":{"value":171.00358563730174,"unit":"u","uncertainty":0.000333,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":70,"unit":"us","uncertainty":30},"decayModes":[{"mode":"alpha","branchingRatio":1,"product":null}],"spin":"3/2-","sourceRef":"nubase-2020"},{"massNumber":172,"symbol":"172Hg","mass":{"value":171.99886204325153,"unit":"u","uncertainty":0.000161,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":231,"unit":"us","uncertainty":9},"decayModes":[{"mode":"alpha","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":173,"symbol":"173Hg","mass":{"value":172.9971443726878,"unit":"u","uncertainty":0.000215,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":800,"unit":"us","uncertainty":80},"decayModes":[{"mode":"alpha","branchingRatio":1,"product":null}],"spin":"(7/2-)","sourceRef":"nubase-2020"},{"massNumber":174,"symbol":"174Hg","mass":{"value":173.9928705936165,"unit":"u","uncertainty":2.04E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":2,"unit":"ms","uncertainty":0.4},"decayModes":[{"mode":"alpha","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":175,"symbol":"175Hg","mass":{"value":174.9914438535045,"unit":"u","uncertainty":8.59E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":10.2,"unit":"ms","uncertainty":0.3},"decayModes":[{"mode":"alpha","branchingRatio":1,"product":null}],"spin":"(7/2-)","sourceRef":"nubase-2020"},{"massNumber":176,"symbol":"176Hg","mass":{"value":175.98734828275414,"unit":"u","uncertainty":1.18E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":20.3,"unit":"ms","uncertainty":1.4},"decayModes":[{"mode":"alpha","branchingRatio":0.9,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":177,"symbol":"177Hg","mass":{"value":176.98628010637233,"unit":"u","uncertainty":8.59E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":117,"unit":"ms","uncertainty":7},"decayModes":[{"mode":"alpha","branchingRatio":1,"product":null}],"spin":"7/2-","sourceRef":"nubase-2020"},{"massNumber":178,"symbol":"178Hg","mass":{"value":177.98248512797062,"unit":"u","uncertainty":1.18E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":266.5,"unit":"ms","uncertainty":2.4},"decayModes":[{"mode":"alpha","branchingRatio":0.89,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":179,"symbol":"179Hg","mass":{"value":178.9818216777154,"unit":"u","uncertainty":3.01E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":1.05,"unit":"s","uncertainty":0.03},"decayModes":[{"mode":"alpha","branchingRatio":0.75,"product":null},{"mode":"beta+","branchingRatio":0.25,"product":null}],"spin":"7/2-","sourceRef":"nubase-2020"},{"massNumber":180,"symbol":"180Hg","mass":{"value":179.9782596583839,"unit":"u","uncertainty":1.4E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":2.59,"unit":"s","uncertainty":0.01},"decayModes":[{"mode":"beta+","branchingRatio":0.52,"product":null},{"mode":"alpha","branchingRatio":0.48,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":181,"symbol":"181Hg","mass":{"value":180.97781950530194,"unit":"u","uncertainty":1.61E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":3.6,"unit":"s","uncertainty":0.1},"decayModes":[{"mode":"beta+","branchingRatio":0.73,"product":null},{"mode":"alpha","branchingRatio":0.27,"product":null}],"spin":"1/2-","sourceRef":"nubase-2020"},{"massNumber":182,"symbol":"182Hg","mass":{"value":181.97468905069957,"unit":"u","uncertainty":1.07E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":10.83,"unit":"s","uncertainty":0.06},"decayModes":[{"mode":"beta+","branchingRatio":0.862,"product":null},{"mode":"alpha","branchingRatio":0.138,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":183,"symbol":"183Hg","mass":{"value":182.97444428264424,"unit":"u","uncertainty":7.51E-06,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":9.4,"unit":"s","uncertainty":0.7},"decayModes":[{"mode":"beta+","branchingRatio":0.883,"product":null},{"mode":"alpha","branchingRatio":0.117,"product":null}],"spin":"1/2-","sourceRef":"nubase-2020"},{"massNumber":184,"symbol":"184Hg","mass":{"value":183.97171748062433,"unit":"u","uncertainty":1.07E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":30.87,"unit":"s","uncertainty":0.26},"decayModes":[{"mode":"beta+","branchingRatio":0.9889,"product":null},{"mode":"alpha","branchingRatio":0.0111,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":185,"symbol":"185Hg","mass":{"value":184.97189032122483,"unit":"u","uncertainty":1.5E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":49.1,"unit":"s","uncertainty":1},"decayModes":[{"mode":"beta+","branchingRatio":0.94,"product":null},{"mode":"alpha","branchingRatio":0.06,"product":null}],"spin":"1/2-","sourceRef":"nubase-2020"},{"massNumber":186,"symbol":"186Hg","mass":{"value":185.96936212486386,"unit":"u","uncertainty":1.29E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":1.38,"unit":"min","uncertainty":0.06},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null},{"mode":"alpha","branchingRatio":0.00016,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":187,"symbol":"187Hg","mass":{"value":186.96981301338684,"unit":"u","uncertainty":1.4E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":1.9,"unit":"min","uncertainty":0.3},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null}],"spin":"3/2-","sourceRef":"nubase-2020"},{"massNumber":188,"symbol":"188Hg","mass":{"value":187.9675811151981,"unit":"u","uncertainty":7.51E-06,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":3.25,"unit":"min","uncertainty":0.15},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null},{"mode":"alpha","branchingRatio":3.7E-07,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":189,"symbol":"189Hg","mass":{"value":188.96819088824822,"unit":"u","uncertainty":3.22E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":7.6,"unit":"min","uncertainty":0.2},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null}],"spin":"3/2-","sourceRef":"nubase-2020"},{"massNumber":190,"symbol":"190Hg","mass":{"value":189.96632184796607,"unit":"u","uncertainty":1.72E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":20,"unit":"min","uncertainty":0.5},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":191,"symbol":"191Hg","mass":{"value":190.9671581388218,"unit":"u","uncertainty":2.36E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":49,"unit":"min","uncertainty":10},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null}],"spin":"3/2-","sourceRef":"nubase-2020"},{"massNumber":192,"symbol":"192Hg","mass":{"value":191.96563477974058,"unit":"u","uncertainty":1.72E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":4.85,"unit":"h","uncertainty":0.2},"decayModes":[{"mode":"ec","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":193,"symbol":"193Hg","mass":{"value":192.9666535730937,"unit":"u","uncertainty":1.72E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":3.8,"unit":"h","uncertainty":0.15},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null}],"spin":"3/2-","sourceRef":"nubase-2020"},{"massNumber":194,"symbol":"194Hg","mass":{"value":193.9654490566109,"unit":"u","uncertainty":3.11E-06,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":447,"unit":"y","uncertainty":28},"decayModes":[{"mode":"ec","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":195,"symbol":"195Hg","mass":{"value":194.9667061767547,"unit":"u","uncertainty":2.47E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":10.69,"unit":"h","uncertainty":0.16},"decayModes":[{"mode":"beta+","branchingRatio":1,"product":null}],"spin":"1/2-","sourceRef":"nubase-2020"},{"massNumber":196,"symbol":"196Hg","mass":{"value":195.96583349275394,"unit":"u","uncertainty":3.11E-06,"conditions":null,"sourceRef":"ame-2020"},"abundance":{"value":0.0015,"unit":"fraction","uncertainty":0.0001,"conditions":null,"sourceRef":"nubase-2020"},"halfLife":{"stable":true},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":197,"symbol":"197Hg","mass":{"value":196.9672139631151,"unit":"u","uncertainty":3.22E-06,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":64.93,"unit":"h","uncertainty":0.07},"decayModes":[{"mode":"ec","branchingRatio":1,"product":null}],"spin":"1/2-","sourceRef":"nubase-2020"},{"massNumber":198,"symbol":"198Hg","mass":{"value":197.9667691937935,"unit":"u","uncertainty":5.37E-07,"conditions":null,"sourceRef":"ame-2020"},"abundance":{"value":0.1004,"unit":"fraction","uncertainty":0.0003,"conditions":null,"sourceRef":"nubase-2020"},"halfLife":{"stable":true},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":199,"symbol":"199Hg","mass":{"value":198.9682809585984,"unit":"u","uncertainty":5.37E-07,"conditions":null,"sourceRef":"ame-2020"},"abundance":{"value":0.1694,"unit":"fraction","uncertainty":0.0012,"conditions":null,"sourceRef":"nubase-2020"},"halfLife":{"stable":true},"decayModes":null,"spin":"1/2-","sourceRef":"nubase-2020"},{"massNumber":200,"symbol":"200Hg","mass":{"value":199.968326906286,"unit":"u","uncertainty":5.37E-07,"conditions":null,"sourceRef":"ame-2020"},"abundance":{"value":0.2314,"unit":"fraction","uncertainty":0.0009,"conditions":null,"sourceRef":"nubase-2020"},"halfLife":{"stable":true},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":201,"symbol":"201Hg","mass":{"value":200.97030308626955,"unit":"u","uncertainty":7.51E-07,"conditions":null,"sourceRef":"ame-2020"},"abundance":{"value":0.1317,"unit":"fraction","uncertainty":0.0009,"conditions":null,"sourceRef":"nubase-2020"},"halfLife":{"stable":true},"decayModes":null,"spin":"3/2-","sourceRef":"nubase-2020"},{"massNumber":202,"symbol":"202Hg","mass":{"value":201.9706436144588,"unit":"u","uncertainty":7.51E-07,"conditions":null,"sourceRef":"ame-2020"},"abundance":{"value":0.2974,"unit":"fraction","uncertainty":0.0013,"conditions":null,"sourceRef":"nubase-2020"},"halfLife":{"stable":true},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":203,"symbol":"203Hg","mass":{"value":202.97287239936963,"unit":"u","uncertainty":1.72E-06,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":46.61,"unit":"d","uncertainty":0.01},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"5/2-","sourceRef":"nubase-2020"},{"massNumber":204,"symbol":"204Hg","mass":{"value":203.97349408875928,"unit":"u","uncertainty":5.37E-07,"conditions":null,"sourceRef":"ame-2020"},"abundance":{"value":0.0682,"unit":"fraction","uncertainty":0.0004,"conditions":null,"sourceRef":"nubase-2020"},"halfLife":{"stable":true},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":205,"symbol":"205Hg","mass":{"value":204.97607284904745,"unit":"u","uncertainty":4.29E-06,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":5.14,"unit":"min","uncertainty":0.09},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"1/2-","sourceRef":"nubase-2020"},{"massNumber":206,"symbol":"206Hg","mass":{"value":205.97751354523277,"unit":"u","uncertainty":2.15E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":8.32,"unit":"min","uncertainty":0.07},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":207,"symbol":"207Hg","mass":{"value":206.98230047838504,"unit":"u","uncertainty":3.22E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":2.9,"unit":"min","uncertainty":0.2},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"9/2+","sourceRef":"nubase-2020"},{"massNumber":208,"symbol":"208Hg","mass":{"value":207.9857540697622,"unit":"u","uncertainty":3.22E-05,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":135,"unit":"s","uncertainty":10},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":209,"symbol":"209Hg","mass":{"value":208.99075678527902,"unit":"u","uncertainty":0.000161,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":6.3,"unit":"s","uncertainty":1.1},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"9/2+","sourceRef":"nubase-2020"},{"massNumber":210,"symbol":"210Hg","mass":{"value":209.9943102162577,"unit":"u","uncertainty":0.000215,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":64,"unit":"s","uncertainty":12},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":211,"symbol":"211Hg","mass":{"value":210.9995813178001,"unit":"u","uncertainty":0.000215,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":26.4,"unit":"s","uncertainty":8.1},"decayModes":[{"mode":"beta-","branchingRatio":1,"product":null}],"spin":"9/2+","sourceRef":"nubase-2020"},{"massNumber":212,"symbol":"212Hg","mass":{"value":212.00324210318902,"unit":"u","uncertainty":0.000322,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":30,"unit":"s"},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":213,"symbol":"213Hg","mass":{"value":213.00880306163904,"unit":"u","uncertainty":0.000322,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":15,"unit":"s"},"decayModes":null,"spin":"9/2+","sourceRef":"nubase-2020"},{"massNumber":214,"symbol":"214Hg","mass":{"value":214.01263561408433,"unit":"u","uncertainty":0.000429,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":8,"unit":"s"},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"},{"massNumber":215,"symbol":"215Hg","mass":{"value":215.01836833959072,"unit":"u","uncertainty":0.000429,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":600,"unit":"ms"},"decayModes":null,"spin":"9/2+","sourceRef":"nubase-2020"},{"massNumber":216,"symbol":"216Hg","mass":{"value":216.02245854262057,"unit":"u","uncertainty":0.000429,"conditions":null,"sourceRef":"ame-2020"},"abundance":null,"halfLife":{"value":2,"unit":"s"},"decayModes":null,"spin":"0+","sourceRef":"nubase-2020"}],"spectroscopy":null,"discovery":{"discoverer":null,"year":"Ancient","location":null,"etymology":"[Pending editorial review]","namedAfter":null},"edu":{"oneLine":{"en":"[Pending editorial review]","es":null,"fr":null,"de":null,"zh":null,"pt":null,"ja":null},"paragraph":null,"misconceptions":[{"belief":"[Pending editorial review]","reality":"[Pending editorial review]","sourceRef":null}],"demos":null,"ngssTags":[],"apTags":null,"relatedElements":null},"sources":[{"id":"pubchem-periodic-table","name":"PubChem Periodic Table","url":"https://pubchem.ncbi.nlm.nih.gov/periodic-table/","edition":null,"publisher":"National Center for Biotechnology Information (NCBI), U.S. National Library of Medicine","publishedYear":null,"accessedDate":"2026-05-04","type":"secondary"},{"id":"ame-2020","name":"Atomic Mass Evaluation 2020 (AME2020)","url":"https://www-nds.iaea.org/amdc/ame2020/mass_1.mas20.txt","edition":null,"publisher":"AMDC / Chinese Physics C","publishedYear":2021,"accessedDate":"2026-10-13","type":"primary"},{"id":"nubase-2020","name":"NUBASE 2020 evaluation of nuclear properties","url":"https://www-nds.iaea.org/amdc/ame2020/nubase_1.mas20.txt","edition":null,"publisher":"AMDC / Chinese Physics C","publishedYear":2021,"accessedDate":"2026-10-13","type":"primary"}],"editorialState":"ingested"}}