In terms of the molecular orbital model, which species in...

In terms of the molecular orbital model, which species in each of the following two pairs will most likely be the one to gain an electron? Explain.
a. CN or NO
b. $\mathrm{O}_{2}^{2+}$ or $\mathrm{N}_{2}{ }^{2+}$

Key Concepts

Lowest Unoccupied Molecular Orbital (LUMO)

The LUMO is the lowest energy molecular orbital that is not occupied by an electron under normal conditions. Its energy level plays a crucial role in determining a species' ability to gain an electron; a lower LUMO energy means the added electron will be more stabilized, making the species more receptive to electron gain.

Molecular Orbital Theory

Molecular orbital theory explains how atomic orbitals combine to form molecular orbitals that are spread over the entire molecule. This theory distinguishes between bonding and antibonding orbitals, providing insight into the distribution and energy levels of electrons in a molecule, which in turn helps predict properties such as bond order and reactivity.

Electron Affinity

Electron affinity refers to the amount of energy released when an electron is added to a neutral atom or molecule. A higher electron affinity indicates a species is more likely to accept an electron, as the process is energetically more favorable, which is an important consideration when predicting electron gain in molecular interactions.

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