Modern Physics can't give us a simple picture of the atoms.
Please read my paper on He-2-4 to understand the Geometry of the nucleus, which is the mother nucleus for rest of nuclei's along with Father H.
It is most Symmetric, most Abundant, most Stable and also satisfies Quark, QCD, Yukawa's unit of strength of 200 Electrons Mass (actually 206), Nature's Packing of Spheres for inner layer and Thompson Problem for outer layer.
There are two ways the mass of the nucleus is calculated to the accuracy of 99%. In complex calculations, we match results up to 4 digits!