(a) N2: bond order 3 , diamagnetic N2+: bond order 2.5, paramagnetic (b) C2: bond order 2 , diamagnetic C2+: bond order 1.5, paramagnetic (c) NO: bond order 2.5, paramagnetic NO+ : bond order 3, diamagnetic (d) O2 : bond order 2, paramagnetic O2+: bond order 2.5, paramagnetic