Francium carbonate (Fr2(CO3)3) is a hypothetical chemical compound composed of francium (Fr) cations and carbonate (CO3) anions.

Francium is a highly radioactive alkali metal, and its half-life is very short, making it extremely challenging to isolate and study in large enough quantities to form compounds. Additionally, the chemical properties of francium are not well understood due to the difficulties in handling and studying this element.

Carbonates are compounds that contain carbonate ions (CO3^2-) and are often found in minerals, rocks, and as key components of substances like limestone and chalk. In theory, if francium were to form a carbonate compound, it would likely resemble the carbonates of other alkali metals like sodium carbonate (Na2CO3) or potassium carbonate (K2CO3).

However, due to the extreme challenges associated with working with francium and its limited availability, the study of francium compounds, including francium carbonate, is largely theoretical and speculative. Research in this area is primarily focused on fundamental atomic and nuclear physics rather than practical chemical applications.