# Subatomic scale

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Domain of physical sizes which are smaller than atoms

See also: [Subatomic particle](/source/Subatomic_particle), [Atomic spacing](/source/Atomic_spacing), [Planck scale](/source/Planck_scale), and [Quantum mechanics](/source/Quantum_mechanics)

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The **subatomic scale** is the domain of physical size that encompasses objects smaller than an [atom](/source/Atom). It is the scale at which the atomic constituents, such as the [nucleus](/source/Atomic_nucleus) containing [protons](/source/Protons) and [neutrons](/source/Neutrons), and the [electrons](/source/Electron) in their [orbitals](/source/Atomic_orbital), become apparent.

The subatomic scale includes the many thousands of times smaller **subnuclear scale**, which is the scale of physical size at which constituents of the [protons](/source/Proton) and [neutrons](/source/Neutron)—particularly [quarks](/source/Quark)—become apparent.

Broadly this may be conveniently divided into:

- **Fundamental** elementary particles as small as 1×10−19 [m](/source/Metre), quanta that have not yet been further divided.

- **Nuclear** or [femtometer](/source/Femtometer) 1×10−15 [m](/source/Metre) scale related to [subatomic particles](/source/Subatomic_particles)

## See also

- [Astronomical scale](/source/Astronomical_scale) the opposite end of the spectrum

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