Vsepr & Hybridisation

Question

Which species is diamagnetic?

RankGuru · Accepted Answer

1. **Magnetic Properties**: 
   - **Paramagnetic**: Contains at least one unpaired electron. Attracted to magnetic fields.
   - **Diamagnetic**: All electrons are paired. Feebly repelled by magnetic fields.
2. **VBT/MOT Analysis**:
   - **$O_2$**: Paramagnetic (has two unpaired electrons in $\pi^*$ orbitals).
   - **$NO$**: Paramagnetic (has 11 valence electrons; an odd number always results in an unpaired electron).
   - **$O_2^-$ (Superoxide)**: Paramagnetic (has 17 total electrons; odd number).
   - **$CO$**: Has 14 electrons (isoelectronic with $N_2$). All orbitals are fully occupied by pairs of electrons.
3. **Result**: **$CO$** is diamagnetic.

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Vsepr & Hybridisation

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