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Reference.org
Subatomic scale
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<p>The subatomic scale is the domain of physical size that encompasses objects smaller than an <a href="/facts/Atom/FoQ4kGN5">atom</a>. It is the scale at which the atomic constituents, such as the <a href="/facts/Atomic_nucleus/orpIm5Xl">nucleus</a> containing <a href="/facts/Protons/clCjepXP">protons</a> and <a href="/facts/Neutrons/oRCM1geb">neutrons</a>, and the <a href="/facts/Electron/L0KBo5cW">electrons</a> in their <a href="/facts/Atomic_orbital/tKhgl6mL">orbitals</a>, become apparent. </p><p>The subatomic scale includes the many thousands of times smaller subnuclear scale, which is the scale of physical size at which constituents of the <a href="/facts/Proton/clCjepXP">protons</a> and <a href="/facts/Neutron/oRCM1geb">neutrons</a>—particularly <a href="/facts/Quark/hwuuVkV5">quarks</a>—become apparent. </p>