The word krypton means "hidden" in Greek. This element exists as an inert gas in nature, which means that it does not react with almost any other element. Krypton is not found in any minerals and only small amounts can be found in air. Pure krypton produces a very bright white light when electrified with a current, making it ideal for use in flash bulbs. In addition, it can react with the element fluorine to form the compound krypton fluoride, KrF, which is used to power some types of lasers.

Summary of properties (Kr)

Atomic weight83.798(2)
Discoverer (year)Ramsay, Wil & Travers, Morris Willliam (1898)
Natural formgas
Electron configuration[Ar] 3d10 4s2 4p6
Melting point (ºC)-157
Boiling point (ºC)-153
Abundance in earth's crust (ppm)<0.001
Isotope (abundance)78Kr (0.355), 80Kr (2.286), 82Kr (11.593), 83Kr (11.500), 84Kr (56.987), 86Kr (17.279)
Density g/cm33.75
Van der Waals radius (pm)202
Covalent radius (pm)116
Electronegativity (Pauling)
Vaporization enthalpy (kJ/mol)9.08
Enthalpy of fusion (kJ/mol)1.64
Specific heat capacity (J/g·K) at 25ºC and 1 atm0.25
Thermal conductivity (W/cm·K) at 25ºC and 1 atm<0.001
Oxidation state0
Electron affinity (eV)unstable ion
1st Ionization potential (eV)13.9996

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