The orbital that is created when the lobes of two p orbitals overlap side by side while being in phase with one another has a lower dissociation energy than the molecular orbital created when the two p orbitals are directly in phase with one another.
When two atoms share a pair of electrons, a covalent bond is created. The electron pair is drawn to both of the nuclei, which keeps the atoms together.
The strongest bond is produced by the head-on overlapping of 2p2p orbitals because the electron density is highest along the bond's axis.
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