Chemical Bonding and Molecular Structure - Result Question 119
####123. The number of anti-bonding electron pairs in $O_2^{-2}$ molecular ion on the basis of molecular orbital theory is, (Atomic number ofO is 8) [1998]
(a) 5
(b) 2
(c) 3
(d) 4
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Solution:
- (d) Total no. of electrons in $O_2{ }^{2-}=16+2=18$ Distribution of electrons in molecular orbital $\sigma 1 s^{2}, \sigma^{} 1 s^{2}, \sigma 2 s^{2}, \sigma^{} 2 s^{2}, \sigma 2 p_x^{2}, \pi 2 p_y^{2}$ $\pi 2 p_z^{2}, \pi^{} 2 p_x^{2} \pi^{} 2 p_y^{2}$ Anti bonding electron $=8$ (4 pairs)
