General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Krypton Symbol Kr
atomic number 36 Atomic weight 83.80
Density @ 293 K 0.003708 g/cm3 Atomic volume 38.9 cm3/mol
Group Noble Gas discovered 1898


state (s, l, g) g
melting point 116.6 K boiling point 119.7 K
Heat of fusion 1.638 kJ/mol Heat of vaporization 9.029 kJ/mol
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1st ionization energy 1350.7 kJ/mole electronegativity 3
2nd ionization energy 2350.3 kJ/mole electron affinity kJ/mole
3rd ionization energy 3565.1 kJ/mole Specific heat 0.248 J/gK
heat atomization 0 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,8 electron configuration [Ar] 3d10 4s2 4p6
minimum oxidation number 0 maximum oxidation number 2
min. common oxidation no. 0 max. common oxidation no. 2
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Appearance & Characteristics

structure fcc: face-centered cubic color colorless
uses lamps, UV-laser toxicity no
hardness mohs characteristics unreactive


reaction with air none reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 none
reaction with 6M NaOH none
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Other Forms

number of isotopes 6 hydride(s) none
oxide(s) none chloride(s) none


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 112 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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thermal conductivity 0.01 J/m-sec-deg electrical conductivity 0 1/mohm-cm
polarizability 2.5 A^3


source Air rel. abund. solar system 1.653 log
abundance earth's crust -4 log cost, pure 33 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.