journal of kerbala university

The method of finding binding energy for electrons in atoms has many difficulties, because there are many mathematical difficulties in it. Up today the problem isn't solve completely and explicitly except for H-atom and for ions like it i.e. the ions have one electron in the outer orbit. To find of He-atom every theories an approximation method to find it. To find the binding energy in multi electrons atom for example (U92) need to solve a system of (92) partial differential equations with (276) independent variable and its impossible to do that, it has been found the binding energy for H-atom in the early days of quantum mechanics. It has been put an equation for the binding energy of H-atom.
Also it has been found an approximate equations for binding energy for He-atom and Li-atom by (Born) by a method called (Born approximation method) it has been reached to a results near to experimental results. It has been found binding energy for large number of atoms approximately in many scientific research institutes. (Hartree, fock, Rothaan).