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.

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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
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Electron Configuration:1s2 2s2p6 3s2p6d10 4s2p6Electrons per Energy Level: 2,8,18,8Shell Model
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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
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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

References

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.

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