A phenomenon that does not have mass and therefore does not occupy space.
Waves travel through space.
A mathematical equation that describes orbitals in which electrons reside. The distance between repeating points on a wave. The principle that all objects in motion are simultaneously particles and waves. Most objects have a wavelength that is too small to be detected. Very light objects, such as photons and electrons, can have wave-lengths large enough to give these objects some of the properties of waves.