The meter (3.3 feet) was once officially defined by the wavelength of krypton-86, the heaviest stable isotope of krypton.When exposed to an electrical current under low pressure, krypton gas lights up like neon - but instead of red-orange, krypton glows smoky white, according to the Jefferson Lab.(Image credit: Greg Robson/Creative Commons, Andrei Marincas Shutterstock) Who knew? Scottish chemist William Ramsay and English chemist Morris Travers were extracting argon for air in hopes of evaporating it and finding a lighter chemical element to fill the gap in the Periodic Table between argon and helium.Įlectron configuration and elemental properties of krypton. The discovery of krypton occurred partially by accident. Most common isotopes: Kr-84 (56.98 percent of natural abundance), Kr-86 (17.279 percent of natural abundance), Kr-82 (11.59 percent of natural abundance), Kr-83 (11.5 percent of natural abundance), Kr-80 (2.28 percent of natural abundance) and Kr-78 (0.35 percent of natural abundance).Number of isotopes (atoms of the same element with a different number of neutrons): 37.Density: 0.003733 grams per cubic centimeter.Atomic weight (average mass of the atom): 83.798. ![]()
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