Krypton

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.

Krypton does not react with water, but is slightly soluble; approximately 59.4 cm³/kg at 20 °C (293 K) [1]