Which quantum mechanical phenomenon increases when spatial overlap integral of two atomic wave functions increases during molecular bonding?

💡 Explanation

When spatial overlap increases, the electron density between the nuclei increases, leading to greater stabilization via increased electron-nucleus attraction and reduced kinetic energy based on the wave functions, which strengthens the covalent bond. Therefore covalent bonding strength results, rather than tunneling, fluorescence, or van der Waals which rely on different conditions and electronic structures.

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