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The electrons never "leave". This is why they are shared, the two cross paths and then enter the orbitals of the other element but to say that they were leaving would be incorrect. This is why when a bond is covalent on a Lewis structure we are able to add one of the electrons into the shell of the other, but we would never be able to have this same shell configuration the moment that element stopped covalently bonding as there is no "leaving".
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