A subatomic scale refers to the domain of physical size that encompasses objects smaller than an atom. It is the scale at which the atomic constituents, such as the nucleus containing protons and neutrons, and the electrons, which orbit in spherical or elliptical paths around the nucleus, become apparent.
This phrase is also sometimes used to refer to the many thousands of times smaller subnuclear scale, which is the scale of physical size at which constituents of the protons and neutrons - particularly quarks - become apparent.
The term "subnuclear" also is used in biology to refer to the constituents of the cell nucleus.
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