Coordination number vs. oxidation number for curium (Cm) Element chosen: Cm Oxidation number (ON) chosen: 4 Coordination number (CN) chosen: 8 Select any formula to view further details for that compound. Formula VCBOLEXZ± [Cm(F)₄]Cm«V4C8OIV» [Cm(O)₂]Cm«V4C8OIV» Total number of compounds: 2