The elements in group 18 of the periodic table (the “noble gases”) were once considered to be chemically inert. But over the years, chemists discovered how to make molecules that contain them.
In the case of krypton, J. J. Turner and G. C. Pimentel at the University of California, Berkeley, used electrical discharge to prepare krypton difluoride (KrF2) in 1963. The colorless solid decomposes at room temperature, but it can be stored indefinitely at –78 ºC.
KrF2 is an extremely strong oxidizing and fluorinating agent. It can convert metallic gold to AuF5, metallic silver to AgF3, and xenon to XeF6. It can also oxidize chlorine and bromine to their +5 oxidation states.
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