Which one of the following has no unpaired electrons?

Step-by-step solution

(a) In O ₂⁻ total number of electrons =16+1=17 Orbital arrangement aligned =K K^ , 2 s², 2 s², 2 p_ z ², 2 p_ x ²= 2 p_ y ², 2 p_ x ² &= 2 p_ y ¹ aligned (b) In O ₂⁺ , total number of electrons =16-1=15 Orbital arrangement = KK ^ , 2 ~s ², 2 ~s ² , 2 p _ z ², 2 p _ x ²= 2 p _ y ², 2 p _ x ¹ (c) In O ₂²⁻ , total number of electrons =16+2=18 Orbital arrangement =K_ K ^ , 2 ~s ², 2 ~s ² , 2 p _ z ², 2 p _ x ²= 2 p _ y ² 2 p _ x ²= 2 p _ y ² (d) In O ₂ , total number of electrons =16 Orbital arrangement =K K K^ , 2 s²,