The energy-momentum tensor for a Maxwellian field has been defined by Landau and Lifshitz and later Sattinger. The solution contains two terms that are the Maxwell stress tensor and a second term, which does not appear in Einstein's treatment, that constitutes a constraint that the geometry of space-time is fixed. The solution is Maxwell's equation on a fixed curvilinear space-time. The field equations of general relativity are then obtained by relaxing the constraint that the curvilinear space-time is fixed and allowing variations in the field and geometric variables. This approach then by-passes the Principle of Equivalence and the postulate that space-time bends in the presence of a force field by showing that space-time must bend in the presence of a Maxwellian field unless it is constrained not to do so. The important conclusion from Sattinger's work is that General Relativity is not specific to gravitation, rather it is universal for any Maxwellian field. It is assumed in the present work that the electromagnetic fields inside the atom are significant and that GR is relevant where the electromagnetic fields are intense. A relativistic model of the atom based on a classical particle model and relativistic interpretation is then developed below.