An atom of radium (ra) forms a monatomic ion which of the following ions does it most likely form?

The atomic number of the element Radium (Ra) is 88. It is an alkaline earth metal. Electronic configuration of Radium (Ra) will be

It belongs to the group IIA of the periodic table. Alkaline earth metals that belong to the group IIA of the periodic table lose the valence electrons to form a +2 ion.

Therefore, Radium with an electronic configuration of   will lose the two 7s electrons to form the cation with +2 charge.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a