# 10- which two ions have the same electron configuration in the ground state (a) Rb+ and Cs+ (b) Ba2+ and I- (c) Se2+ and I- (d) Fe2+ and Fe3+ #12- which of the following combinations of quantum numbers can refer to an electron in a ground state cobalt (a) n=2, I=O mi=0 (b) n=3, I=1, mi=2 (c) n=4, I=2, Mi=-1