Chemicool

Kr

36

83.80
Krypton
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General

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

States

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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Energies

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

Reactions

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

Radius

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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Conductivity

thermal conductivity 0.01 J/m-sec-deg electrical conductivity 0 1/mohm-cm
polarizability 2.5 A^3

Abundance

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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