free electrons

free electron

noun Physics.
an electron that is not attached to an atom or molecule and is free to respond to outside forces.

Origin:
1905–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
free electron
 
n
any electron that is not attached to an ion, atom, or molecule and is free to move under the influence of an applied electric or magnetic field

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