The atomic number of the element Radium (Ra) is 88. It is an alkaline earth metal. Electronic configuration of Radium (Ra) will be [tex][Rn]7s^{2}[/tex]
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 [tex][Rn]7s^{2}[/tex] will lose the two 7s electrons to form the cation with +2 charge.
