While we can theoretically predict the formula based on its position in the periodic table, it's important to note that this is purely theoretical and there is no experimental confirmation.
Based on its position in the periodic table, francium is expected to form a +1 cation like other alkali metals. Oxygen typically forms a -2 anion. Therefore, the predicted formula for francium oxide would be Fr₂O.
However, remember that this is just a prediction and the actual properties and existence of francium oxide are unknown due to its extreme radioactivity and short half-life.
