1. Tardigrade
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  3. Chemistry
  4. Which of the following species exhibits the diamagnetic behaviour?

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Q. Which of the following species exhibits the diamagnetic behaviour?

AIEEEAIEEE 2007Chemical Bonding and Molecular Structure

Solution:

The correct option is $O^{2-}_2$
This species has 18 e-, which are filled in such a way that all molecular orbitals are fully filled, so diamagnetic.
$\sigma1s^{2}\,\sigma^{*}\,1s^{2}, \sigma2s^{2}\,\sigma^{*}\,2s^{2}, \sigma2p^{2}_{z}, \pi2p^{2}_{x}=\pi2p^{2}_{y}, \pi^{*}\,2p^{2}_{x}=\pi^{*}\,2p^{2}_{y}$
Hence, (1) is correct.