A photon, for example, is a single quantum of [[light]], and may thus be referred to as a "light quantum". The [[energy]] of an [[electron]] bound to an [[atom]] (at rest) is said to be quantized, which results in the stability of atoms, and of [[matter]] in general. | A photon, for example, is a single quantum of [[light]], and may thus be referred to as a "light quantum". The [[energy]] of an [[electron]] bound to an [[atom]] (at rest) is said to be quantized, which results in the stability of atoms, and of [[matter]] in general. |