what is the difference between molecular orbitals and atomic orbitals?
When two atoms move closer together to form a molecule, atomic orbitals overlap and combine to become molecular orbitals. The number of newly formed molecular orbitals is equal to the number of combined atomic orbitals. The molecular orbital surrounds the two nuclei of the atoms, and electrons can move around both nuclei.
On the other hand atomic orbital surrounds the nuclei of only one atom and electrons can only move around the nucleus of that atom.