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Title: Chemistry/Elements/Krypton - EnvironmentalChemistry.com: Krypton Atomic structure, properties, and table of nuclides.
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Periodic Table of Elements: Krypton – Kr (EnvironmentalChemistry.com)
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Periodic Table of ElementsElement Krypton – KrComprehensive 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 studies.
Using the "Periodic Table of Elements Quick Navigation" graphic at the bottom of the sidebar menu, one can quickly jump from chemical element to chemical element.
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 LanguagesLatin: KryptonCzech: KryptonCroatian: KriptonFrench:
KryptonGerman: Krypton - rItalian: CriptoNorwegian: KryptonPortuguese: Criptônio
Russian:  Spanish: CriptónSwedish:
Krypton
Atomic Structure of Krypton
Atomic Radius: 1.03Å
Atomic Volume: 38.9cm3/mol
Covalent Radius: 1.12Å
Cross Section (Thermal Neutron Capture)  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 PotentialFirst: 13.999Second: 24.359Third: 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
ConductivityElectrical: 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: OC6772500OSHA Permissible Exposure Limit (PEL)No limits set by
OSHA
OSHA PEL Vacated 1989No 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: 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 / HowDiscoverer: Sir William Ramsey, M.W. TraversDiscovery Location: London England
Discovery Year: 1898Name 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.
[Last update: 2/22/2007]Notes below
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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
Related Resources
Anatomy of the Atom
Answers many questions regarding the structure of atoms.
Molarity, Molality and Normality
Introduces stoichiometry and explains the differences between molarity, molality and normality.
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.
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