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What does energy level mean?

Looking for the meaning or definition of the word energy level? Here's what it means.

Noun
  1. Used other than with a figurative or idiomatic meaning: see energy,‎ level.
  2. (physics) any of the discrete stable energies that a quantum mechanical system (such as the electrons of an atom) can have
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Examples
An electron in a lower energy level is both closer to the nucleus and has fewer electrons between itself and the nucleus.
Air pistols are limited by law to a kinetic energy level of six foot-pounds.
When a photon strikes the surface of a metal, it raises the energy level of the metal and causes the ejection of electrons.
An electric field emanating from the charged red atom causes energy level shifts in the molecule, allowing current to flow.
This means that an atom with eight electrons in its outermost energy level is very stable.
When an electron falls from a higher energy level to a lower energy level, a photon is given off.

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