Element Krypton - Kr

Comprehensive data on the chemical element Krypton is provided on this page; including scores of properties, element names in many languages, most known nuclides of Krypton. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one"s studies.

You are watching: How many valence electrons are in krypton

Krypton Menu

Krypton Page OneOverview of KryptonKrypton"s Name in Other LanguagesAtomic Structure of KryptonChemical Properties of KryptonPhysical Properties of KryptonRegulatory / HealthWho/When/Where/HowKrypton Page TwoNuclides / IsotopesPotential Parent Nuclides

Overview of Krypton

Atomic Number: 36Group: 18Period: 4Series: Noble Gasses

Krypton"s Name in Other Languages

Latin: KryptonCzech: KryptonCroatian: KriptonFrench: KryptonGerman: Krypton - rItalian: CriptoNorwegian: KryptonPortuguese: CriptônioRussian: КриптонSpanish: CriptónSwedish: KryptonAtomic Structure of KryptonAtomic Radius: 1.03ÅAtomic Volume: 38.9cm3/molCovalent Radius: 1.12ÅCross Section (Thermal Neutron Capture) σa/barns: 25Crystal Structure: Cubic face centered
Electron Configuration:1s2 2s2p6 3s2p6d10 4s2p6Electrons per Energy Level: 2,8,18,8Shell Model
Ionic Radius:
Filling Orbital: 4p6Number of Electrons (with no charge): 36Number of Neutrons (most common/stable nuclide): 48Number of Protons: 36Oxidation States: 0Valence Electrons: 4s2p6Electron Dot Model

Chemical Properties of Krypton

Electrochemical Equivalent:
Electron Work Function:Electronegativity: N/A (Pauling); 2.94 (Allrod Rochow)Heat of Fusion: 1.638kJ/molIncompatibilities:Ionization PotentialFirst: 13.999Second: 24.359Third: 36.95Valence Electron Potential (-eV):

Physical Properties of Krypton

Atomic Mass Average: 83.8Boiling Point: 119.95K -153.2°C -243.8°FCoefficient of lineal thermal expansion/K-1: N/AConductivityElectrical: Thermal: 0.0000949 W/cmKDensity: 3.75g/L
273K & 1atmDescription: Colorless, odorless, tasteless noble gas.Enthalpy of Fusion: 1.64 kJ/moleEnthalpy of Vaporization: 9.03 kJ/moleFlammablity Class:Freezing Point: see melting pointHeat of Vaporization: 9.029kJ/molMelting Point: 115.93K -157.22°C -251°FMolar Volume: 32.2 cm3/moleOptical Refractive Index: 1.000427Physical State (at 20°C & 1atm): GasSpecific Heat: 0.248J/gK

Regulatory / Health

CAS Number7439-90-9RTECS: OC6772500OSHA Permissible Exposure Limit (PEL)No limits set by OSHAOSHA PEL Vacated 1989No limits set by OSHANIOSH Recommended Exposure Limit (REL)No limits set by NIOSH Levels In Humans:Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.Blood/mg dm-3: traceBone/p.p.m: nilLiver/p.p.m: nilMuscle/p.p.m: nilDaily Dietary Intake: n/aTotal Mass In Avg. 70kg human: n/a

Who / Where / When / How

Discoverer: Sir William Ramsey, M.W. TraversDiscovery Location: London EnglandDiscovery Year: 1898Name Origin:Greek: kryptos (hidden).Abundance of Krypton:Earth"s Crust/p.p.m.: 0.00001Seawater/p.p.m.: 0.00008Atmosphere/p.p.m.: 1.14Sun (Relative to H=1E12): N/ASources of Krypton:Forms 1 millionth of the atmosphere. Obtained from production of liquid air. Around 8 tons of krypton is produced each year world wide.Uses of Krypton:Used in fluorescent bulbs, flashbulbs, UV lasers and as a wavelength standard.Additional Notes:Although krypton is a harmless gas, it could asphyxiate if it excluded oxygen from the lungs.

Krypton Menu

Krypton Page OneOverview of KryptonKrypton"s Name in Other LanguagesAtomic Structure of KryptonChemical Properties of KryptonPhysical Properties of KryptonRegulatory / HealthWho/When/Where/HowKrypton Page TwoNuclides / IsotopesPotential Parent Nuclides


A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

Related Resources

Anatomy of the AtomAnswers many questions regarding the structure of atoms.Molarity, Molality and NormalityIntroduces stoichiometry and explains the differences between molarity, molality and normality.Molar Mass Calculations and Javascript CalculatorMolar mass calculations are explained and there is a JavaScript calculator to aid calculations.Chemical DatabaseThis database focuses on the most common chemical compounds used in the home and industry.

Citing this page

If you need to cite this page, you can copy this text:

Linking to this page

If you would like to link to this page from your website, blog, etc., copy and paste this link code (in red) and modify it to suit your needs:

echo Periodic Table of Elements: Krypton - Kr (sdrta.net)- Comprehensive information for the element Krypton - Kr is provided by this page including scores of properties, element names in many languages, most known nuclides and technical terms are linked to their definitions..


PLEASE, if you like an article we published simply link to it on our website do not republish it.

25 years on the web


Please Share and/or Link To This Page

Please share and/or link to this page if you find it useful or informative.


We are a great educational resource! Use online or print pages out as classroom handouts. More info.

See more: How Long To Wait After Adding Baking Soda To Pool : And Why!

Career Listings

Biology careers in CAChemical Engineering careers in CAChemistry careers in CAEcologists careers in CAEducation careers in CAEnvironmental careers in CAEnvironmental Chemists careers in CAEnvironmental Compliance careers in CAEnvironmental Consultant careers in CAEnvironmental Engineering careers in CAEnvironmental Law careers in CAForestry careers in CAGIS careers in CAGovernment careers in CAHealth & Safety careers in CARegulatory Compliance careers in CARisk Management careers in CAScience careers in CA
Biology careers in UKChemical Engineering careers in UKChemistry careers in UKEcologists careers in UKEducation careers in UKEnvironmental careers in UKEnvironmental Consultant careers in UKEnvironmental Engineering careers in UKEnvironmental Law careers in UKGIS careers in UKHazardous Materials/Waste careers in UKHealth & Safety careers in UKRegulatory Compliance careers in UKRisk Management careers in UKScience careers in UK
Biomedical Engineering careers in USChemical Engineering careers in USChemistry careers in USConservation careers in USEcologists careers in USEmergency Management careers in USEnvironmental Careers careers in USEnvironmental Analyst careers in USEnvironmental Chemists careers in USEnvironmental Compliance careers in USEnvironmental Consultant careers in USEnvironmental Engineering careers in USEnvironmental Law careers in USEnvironmental Planning careers in USHealth & Safety careers in USNatural Resources careers in USNature Preserves careers in USRegulatory Compliance careers in USRisk Management careers in USSchool Principals careers in US
Job Listing Search:All CategoriesAccountingAdmin & ClericalBankingBiotechBroadcast/JournalismBusiness DevelopmentConstructionConsultantCustomer ServiceDesignDistribution/ShippingEducationEngineeringExecutiveFacilitiesFinanceGeneral BusinessGovernmentHealth CareHuman ResourcesInformation TechnologyInsuranceInventoryLegalManagementManufacturingMarketingNursePharmaceuticalProfessional ServicesPurchasing/ProcurementQA/Quality ControlResearchSalesScienceSupply ChainTelecommunicationsTrainingTransportationWarehouseCanadaIndiaU.K.U.S.


Periodic TableNitrogen Dioxide, Ozone & Lead Partner to Increase Pollution Dangers to Urban ChildrenPrairie Dogs: A Threatened Species or Public Health Nuisance?

Go Green

RedecoratingPainting WallsReplacing CarpetsUpdating Light FixturesBathroom RenovationInstalling a low flow showerhead Switching to Renewable EnergyBuying local clean power electricityKitchen Renovation - Coming in 2010 or 2011Weatherization - Coming late 2009Energy AuditRevised ROI Calculations

Environmental Issues

ADA Recommendation for Fluoride in Infant DietsAsbestosAsbestos, a Brief History its Uses & Health RisksAsbestos, its Chemical & Physical PropertiesAsbestos: A Manufacturing Health Hazard Dating to Prehistoric TimesDry-Cleaning ChemicalsLooking Good, Feeling Bad; or, What"s the Problem with Perc?Are there Realistic Dry-Cleaning Alternatives to Perc?DuPont"s Teflon Cover-upNeurodevelopmental Disorders in Children: Autism & ADHDPCBs in the food you loveSeafood SafetyMercury in Fish vs. the Benefits of Fish OilsNorwegian Farmed Salmon Raises Global ConcernThe Dangers of Lawn Chemicals at Home
Biofueling to the futureCO2 Pollution and Global WarmingCompact Fluorescent Lights (CFLs): Are They Worth the Switch?Global Trends in Energy Technology InnovationHydrogen Fuel Cells: Energy of the Future
ChernobylChernobyl RevisitedAgricultural and Environmental ImpactA Turning PointFrom Bhopal to Hazardous Waste ComplianceLove Canal NY: Grownups Don"t Do Blue GooNew Orleans, Hurricane Katrina & the Oil Industry
Environmental Justice and the NIMBY PrinciplePrairie Dogs: Small mammal, big controversyPrairie Dogs: A Threatened Species or Public Health Nuisance?Prairie Dog Control: Non-Lethal TechniquesPrairie Dog Control: Lethal TechniquesCan Prairie Dogs be Managed Utilizing Reconciliation Ecology?Pseudoscience: A Threat to Our EnvironmentSorting out Science from Junk Science
Effects of Air Pollution on your healthClean Air Act Contributing to Mercury ProblemNitrogen Dioxide, Ozone & Lead Partner to Increase Pollution Dangers to Urban ChildrenThe Heat facing Outdoor Wood Furnaces & Boilers
PCBs in New York"s Hudson RiverIncreased Mercury Levels Attributed to Industrial ActivitiesEnvironmental Pollution of the Concord River
Guide to Handling Household ChemicalsHow Well Do You Know Recycled Paper?Protecting Wildlife from TrashPlastics - From Recycling Bin to New ProductRoHS: Europe"s Initiative to Control Technological WasteTreatment of Biohazardous WasteThe History of Waste


Anatomy of the AtomThe Chemistry of Polychlorinated BiphenylsMolar Mass Calculations and Molecular Weight CalculatorStoichiometry: Molarity, Molality and NormalityWhat You Do and Don"t Know About Fluorine
Chemical DatabaseChemistry DictionaryPeriodic Table of ElementsSort periodic table by: select orderAtomic RadiusBoiling PointCovalent RadiusCross SectionCrystal StructureDensityElectrical ConductivityEletronegativityFreezing PointHeat of VaporizationIonic RadiusIonization PotentialMass AverageMelting PointNamePeriodic TableSeriesSymbolThermal ConductivityYear of Discovery

Hazardous Materials

Guide to Handling Household ChemicalsThe Dangers of Lawn Chemicals at Home
Emergency Response Guidebook (ERG)List materials byUN NumberMaterial Name49CFR USDOT Hazardous Materials TableUSDOT HazMat Placards Select Class/Div.1 Explosives2 Compressed Gas3 Flammable Liquid4 Flammable Solids5 Oxidizers6.1 Poisons7 Radioactives8 Corrosives9 MiscellaneousRelated MarkingsPlacarding QuizUSDOT HazMat Placards CD & training modulesExceptions, Exemptions and VariancesFMCSA HazMat Transportion Permit System