To simplify and make my cosmic and atomic model a little understandable, I put this schematic drawing for you.
As you will see, the cosmos is structured in a chained way so that each more primitive cosmic element will produce the next one with more complexity.
Cosmic energy (dark energy, eather) in its three-dimensional form will create the gravity effect, which will accumulate and condense cosmic energy in the form of matter, with its corresponding mass.
(As the drawing shows the cosmic energy is difficult to observe, while with gravity, matter, etc., is already more easy of being observed.)
When this matter is concentrated with great density, it produces various electromagnetic fields, which in the end are what maintain the structure of the cosmos in a balanced way.
Therefore orbital systems (atoms, stars, electron-neutrino, planet satellites, etc.) and other particles are stable because they maintain the energy density that the cosmos allows* them and that the electromagnetic fields monitor.
On the other hand, unstable particles have electromagnetic charges of various kinds that try to recycle them back into stable particles.
Among the unstable are large systems that exceed the total energy level and self-destruct to form other smaller particles, by the action of a high potential magnetic force, (uranids, supernovae, etc.)
** The average energy density is a parameter that the Cosmos tends to maintain in all places of the same, since if the cosmic energy fills and occupies all the space, it will have the behaviour of a fluid that tries to maintain the same pressure all the places of the Cosmos.
In physics the definition of entropy is used as a parameter similar to or synonymous with this average total energy density in any cosmic system.