What is the Schrodinger equation? What is a wave function? How is a wave function related to an orbital?
Solution We have been asked to arrange the atoms in order of increasing radius. Step1 The size of atoms increases as we come down along a group. This is because a new shell is being added which results in an increase in screening effect.Thus the effective nuclear pull experienced by the outermost electron decreases.Na comes in the 3rd period and calcium in the fourth period.Thus calcium is larger in size than sodium.Ba and Ca belongs to the same group but Ba comes below Ca in the group and is thus larger in size .So the increasing order of size is Na