Reaction of krypton with halogens
Krypton will react with fluorine, F2, when cooled to -196 °C (liquid nitrogen) and zapped with an electric discharge or X-rays, forming krypton(II) fluoride, KrF2.
Kr(s) + F2(s) KrF2(s)
This compound decomposes when heating to room temperature.
The other halogens do not react with krypton.
Reaction of krypton with the water
Krypton does not react with water, but is slightly soluble; approximately 59.4 cm3/kg at 20 °C (293 K)