According to our current understanding in particle physics, protons, neutrons, and electrons are not considered perfect spheres. Instead, they are described as point-like particles or elementary particles, which means they are treated as having no spatial extent.
Protons and neutrons are composite particles made up of smaller particles called quarks. The current model, known as the Standard Model, describes protons and neutrons as consisting of three quarks each. The distribution of quarks within these particles is not spherically symmetric. The quarks are held together by the strong nuclear force, which is mediated by particles called gluons.
Electrons, on the other hand, are elementary particles and are not made up of smaller constituents. They are described as point-like particles with no internal structure in the Standard Model. However, it is important to note that electron clouds, which describe the probability distributions of electrons in atoms and molecules, are not perfectly spherical due to various factors such as the influence of other particles and external fields.
It's worth mentioning that our understanding of the fundamental particles and their properties continues to evolve with ongoing research. Future discoveries and advancements in particle physics may provide more insights into the true nature of these particles, including their spatial characteristics.