And it has an empty pur two P orbital given here. So it has a positive charge. So here's an example of a Lewis base. Once again, a Lewis base is a molecule containing a pair of electrons, a pair of non bonding electrons in an orbital. So hydrant is an example of a Lewis base because it has two electrons, a pair of non bonding electrons within the one S orbital. Now, when the Lewis acid react with the Lewis base, that basically means their atomic orbitals interact.