Californium(III) oxychloride

Californium oxychloride (CfOCl) is a radioactive salt first discovered in measurable quantities in 1960. It is composed of a single californium cation and oxychloride consisting of one chloride and one oxide anion. It was the first californium compound ever isolated.

Synthesis
Treatment of Cf2O3 with moist hydrogen chloride or CfCl3 with water vapor.

Physical properties
The compound form pale green crystals.