(A) The electronic configuration of $O_2$ ($16$ electrons) is: $(\sigma 1s)^2 (\sigma^* 1s)^2 (\sigma 2s)^2 (\sigma^* 2s)^2 (\sigma 2p_z)^2 (\pi 2p_x)

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(A) The electronic configuration of $O_2$ ($16$ electrons) is: $(\sigma 1s)^2 (\sigma^* 1s)^2 (\sigma 2s)^2 (\sigma^* 2s)^2 (\sigma 2p_z)^2 (\pi 2p_x)^2 (\pi 2p_y)^2 (\pi^* 2p_x)^1 (\pi^* 2p_y)^1$. The number of bonding electrons $(N_b)$ $= 10$. The number of antibonding electrons $(N_a)$ $= 6$. Bond order $= \frac{1}{2} [N_b - N_a] = \frac{1}{2} [10 - 6] = 2$.