There is only one cesium ion on reactant (left hand side) of the reaction equation.
The formation of cesium fluoride involves the combination of cesium ion and fluoride ion. Cesium fluoride is an ionic compound since it is composed of ions.
The reaction between cesium ions and fluoride ions to form cesium fluoride occurs as follows;
Cs^+ + F^- ------> CsF
So, there is only one cesium ion on reactant (left hand side) of the reaction equation.
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