Among H_2, He_2^{+}, Li_2, Be_2, B_2, C_2, N_ | vedclass

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(D) To determine the magnetic nature,we use Molecular Orbital Theory $(MOT)$ configurations:$H_2 (2e^-): \sigma 1s^2$ (Diamagnetic)$He_2^+ (3e^-): \si

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$5$

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(D) To determine the magnetic nature,we use Molecular Orbital Theory $(MOT)$ configurations:$H_2 (2e^-): \sigma 1s^2$ (Diamagnetic)$He_2^+ (3e^-): \sigma 1s^2, \sigma^* 1s^1$ (Paramagnetic)$Li_2 (6e^-): \sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2$ (Diamagnetic)$Be_2 (8e^-): \sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2$ (Diamagnetic,though unstable)$B_2 (10e^-): \sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^1, \pi 2p_y^1$ (Paramagnetic)$C_2 (12e^-): \sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^2, \pi 2p_y^2$ (Diamagnetic)$N_2 (14e^-): \sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^2, \pi 2p_y^2, \sigma 2p_z^2$ (Diamagnetic)$O_2^- (17e^-): \sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \sigma 2p_z^2, \pi 2p_x^2, \pi 2p_y^2, \pi^* 2p_x^2, \pi^* 2p_y^1$ (Paramagnetic)$F_2 (18e^-): \sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \sigma 2p_z^2, \pi 2p_x^2, \pi 2p_y^2, \pi^* 2p_x^2, \pi^* 2p_y^2$ (Diamagnetic)The diamagnetic species are $H_2, Li_2, Be_2, C_2, N_2$,and $F_2$. Excluding $Be_2$ due to its non-existence,the count is $5$.

Among $H_2, He_2^{+}, Li_2, Be_2, B_2, C_2, N_2, O_2^{-}$,and $F_2$,the number of diamagnetic species is (Atomic numbers: $H=1, He=2, Li=3, Be=4, B=5, C=6, N=7, O=8, F=9$)

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