Question

Given the chemical formulas Na2O, MgO, and Al2O3, predict the formula for radioactive francium oxide, Fr?O?.

Answer 1

francium oxide Fr₂O

Francium, as well as sodium, is in 1A group. Its valency is equal to unit.

Answer 2

Fr2O

Fr and Na are both in group 1 meaning they both have a +1 charge and will form similar compounds.