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Periodic Table of Elements

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.

Krypton Menu

• Krypton Page One
  • Overview of Krypton
  • Krypton's Name in Other Languages
  • Atomic Structure of Krypton
  • Chemical Properties of Krypton
  • Physical Properties of Krypton
  • Regulatory / Health
  • Who/When/Where/How
• Krypton Page Two
  • Nuclides / Isotopes
  • Potential Parent Nuclides

Overview of Krypton

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

Krypton's Name in Other Languages

• Latin: Krypton
• Czech: Krypton
• Croatian: Kripton
• French: Krypton
• German: Krypton - r
• Italian: Cripto
• Norwegian: Krypton
• Portuguese: Criptônio
• Russian: Криптон
• Spanish: Criptón
• Swedish: Krypton

Atomic Structure of Krypton

• Atomic Radius: 1.03Å
• Atomic Volume: 38.9cm³/mol
• Covalent Radius: 1.12Å
• Cross Section (Thermal Neutron Capture) σ_a/barns: 25
• Crystal Structure: Cubic face centered

  

• Electron Configuration:

  1s² 2s²p⁶ 3s²p⁶d¹⁰ 4s²p⁶

• Electrons per Energy Level: 2,8,18,8

  Shell Model
  

• Ionic Radius:
• Filling Orbital: 4p⁶
• Number of Electrons (with no charge): 36
• Number of Neutrons (most common/stable nuclide): 48
• Number of Protons: 36
• Oxidation States: 0
• Valence Electrons: 4s²p⁶

  Electron Dot Model
  

Chemical Properties of Krypton

• Electrochemical Equivalent:
• Electron Work Function:
• Electronegativity: N/A (Pauling); 2.94 (Allrod Rochow)
• Heat of Fusion: 1.638kJ/mol
• Incompatibilities:

• Ionization Potential
  • First: 13.999
  • Second: 24.359
  • Third: 36.95
• Valence Electron Potential (-eV):

Physical Properties of Krypton

• Atomic Mass Average: 83.8
• Boiling Point: 119.95K -153.2°C -243.8°F
• Coefficient of lineal thermal expansion/K^-1: N/A
• Conductivity

  Electrical:
  Thermal: 0.0000949 W/cmK

• Density: 3.75g/L @ 273K & 1atm
• Description:

  Colorless, odorless, tasteless noble gas.

• Enthalpy of Fusion: 1.64 kJ/mole
• Enthalpy of Vaporization: 9.03 kJ/mole
• Flammablity Class:
• Freezing Point: see melting point
• Heat of Vaporization: 9.029kJ/mol
• Melting Point: 115.93K -157.22°C -251°F
• Molar Volume: 32.2 cm³/mole
• Optical Refractive Index: 1.000427
• Physical State (at 20°C & 1atm): Gas
• Specific Heat: 0.248J/gK

Regulatory / Health

• CAS Number
  • 7439-90-9
• RTECS: OC6772500
• OSHA Permissible Exposure Limit (PEL)
  • No limits set by OSHA
• OSHA PEL Vacated 1989
  • No limits set by OSHA
• NIOSH 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: trace
  • Bone/p.p.m: nil
  • Liver/p.p.m: nil
  • Muscle/p.p.m: nil
  • Daily Dietary Intake: n/a
  • Total Mass In Avg. 70kg human: n/a

Who / Where / When / How

• Discoverer: Sir William Ramsey, M.W. Travers
• Discovery Location: London England
• Discovery Year: 1898
• Name Origin:

  Greek: kryptos (hidden).

• Abundance of Krypton:
  • Earth's Crust/p.p.m.: 0.00001
  • Seawater/p.p.m.: 0.00008
  • Atmosphere/p.p.m.: 1.14
  • Sun (Relative to H=1E¹²): N/A
• Sources 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 One
  • Overview of Krypton
  • Krypton's Name in Other Languages
  • Atomic Structure of Krypton
  • Chemical Properties of Krypton
  • Physical Properties of Krypton
  • Regulatory / Health
  • Who/When/Where/How
• Krypton Page Two
  • Nuclides / Isotopes
  • Potential 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.

Related Resources

• Anatomy of the Atom
  Answers many questions regarding the structure of atoms.
• Molarity, Molality and Normality
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• Molar Mass Calculations and Javascript Calculator
  Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
• Chemical Database
  This 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:

Kenneth Barbalace. Periodic Table of Elements - Krypton - Kr. EnvironmentalChemistry.com. 1995 - 2024. Accessed on-line: 12/21/2024
https://EnvironmentalChemistry.com/yogi/periodic/Kr.html
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