ENERGYLEVEL

Energy level

A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy. This contrasts with classical particles, which can have any energy. These discrete values are called energy levels. The term is commonly used for the energy levels of electrons in atoms or molecules, which are bound by the electric field of the nucleus, but can also refer to energy levels of nuclei or vibrational or rotational energy levels in molecules. The energy spectrum of a system with such discrete energy levels is said to be quantized.

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energy level

Noun

  1. any of the discrete stable energies that a quantum mechanical system (such as the electrons of an atom) can have


The above text is a snippet from Wiktionary: energy level
and as such is available under the Creative Commons Attribution/Share-Alike License.

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