Based on the position of these elements which form cations, other examples would include Mg, Fe, Co, Ni, Rb, Li.
Work Step by Step
Note that the cation-forming elements listed in the question are on the left side of the periodic table, so elements on that side in the same columns should also form cations (e.g. Li, Rb, Mg). Also, the metals in the center of the table, such as Fe, are also prone to form cations.