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energy level

Syllabification: en·er·gy lev·el

Definition of energy level in English:

noun

Physics
The fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
Example sentences
  • This means that an atom with eight electrons in its outermost energy level is very stable.
  • An electron in a lower energy level is both closer to the nucleus and has fewer electrons between itself and the nucleus.
  • When an electron falls from a higher energy level to a lower energy level, a photon is given off.

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