a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules; "according to quantum theory only certain energy levels are possible"
A measure of the amount of energy possessed by an electron when it is in an atom.
the quantity of energy associated with an electron. An increase in energy will shift electrons to higher energy levels within an atom.
A particular level, or amount, of energy possessed by an atom or ion above the energy it possesses in its least energetic state; also used to refer to the states of energy an electron can have in an atom.
One of a number of states an electron may occupy in an atom, depending on its binding energy.
the allowable stable states of energy from quantum mechanical principles.