Which concept describes the mixing of atomic orbitals of similar energy on the same atom to form new orbitals of equal energy?

• A. Hybrid orbitals
• B. Dipole
• C. London dispersion forces
• D. Hybridization

Answer: (D)

Hybridization is the process by which atomic orbitals on the same atom mix to form a new set of equivalent-energy orbitals. When orbitals with similar energy combine, the electrons occupy these new hybrid orbitals that have the same energy and directional character, which explains the observed bond directions and molecular shapes. For example, carbon can mix one s orbital with three p orbitals to form four sp3 hybrid orbitals, giving four equivalent bonds in a tetrahedral arrangement. The focus here is on the mixing itself—the creation of degenerate, oriented orbitals—rather than the resulting orbitals being named. The other terms describe different concepts: a dipole is charge separation within a molecule, and London dispersion forces are weak intermolecular forces, neither of which capture the idea of orbital mixing to form new, equal-energy orbitals.