N₂ = $\mathrm{\sigma }$ (1s)² < $\mathrm{\sigma }$* (1s)² < $\mathrm{\sigma }$ (2s)² < $\mathrm{\sigma }$* (2s)² < $\mathrm{\pi }$ (2p_x)² = $\mathrm{\pi }$(2p_y)² < $\mathrm{\sigma }$ (2p_z)²

Number of unpaired electron in N₂ and C₂ = 0 , so both are diamagnetic in nature

Number of unpaired electron in O₂ and S₂ =  two, so both are paramagnetic in nature