I think that such a notion is mistaken, because, if it were correct, we should take that all these constituent particles originated independently from each other and then met together with formation of each atom separately, what is highly improbable. The droplet nuclear model is, possibly, more realistic. However, the PFO-CFO Theory of Solar System Formation and Transformation leads to the conclusion that atomic nuclei are composed of positively charged substance, which can be termed protons, and of mass/energy, which can be termed neutrons; both can be symbolically taken particulate.