Skip links

Krypton (Kr): Fun Facts and Information About the Element


What is the symbol? Kr
What is the atomic number? 36
What is the atomic weight? 83.8
What is the melting point in Celsius? -157
What is the boiling point in Celsius? -153
What is the density (g/cm3)? 3.75
What year was it discovered? 1898
Who discovered the element? “Sir William Ramsay and Morris M. Travers”
What group is the element in? 18
What is the electron configuration? [Ar] 3d10 4s2 4p6
What is the ionization energy? 13.9996
What element category is it in? Noble gases

Where is Krypton Found?

Krypton is present in the air to the extent of about 1 ppm. The atmosphere of Mars has been found to contain 0.3 ppm of krypton. Solid krypton is a white crystalline substance with a face-centered cubic structure which is common to all the “rare gases.”

What is Krypton Used For?

Krypton clathrates are prepared using hydroquinone and phenol. 85Kr can be used for chemical analysis by imbedding the isotope in various solids. During this process, kryptonates are formed. Kryptonate activity is sensitive to chemical reactions at the solution surface. Estimates of the concentration of reactants are therefore made possible. Krypton is used in certain photographic flash lamps for high-speed photography. Uses thus far have been limited because of its high cost, as Krypton gas presently costs about $30/l.