Subject of modern nuclear physics
Periodic table of elements defines the realm of atomic phenomena. The systematic behavior of chemical elements properties is connected with the
systematics of the quantum-mechanical electron shells in the Coulomb field of atomic nucleus.
In analogy the systematic of nuclear properties is connected with systematics of quantum-mechanical shells for nucleons moving in the nucleus mean field. The mapping of nuclear properties should now be two dimensional as there are two sorts of nucleons: neutrons and protons.