Question

Which choices contain an isoelectronic pair in the ground state?
I. Cr +/Mo +
II. Cl− /O2−
III. Na+ /O 2−
IV. Ru2+ /Rh 2+
V. Kr/Sr 2+
A) I, V
B) III, V
C) I, II
D) III, IV
E) II, IV