free electron

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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Free electron is always a great word to know.
So is base unit. Does it mean:
one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences
pertaining to a process that occurs within an atom; noting a particle contained in an atom, such as electrons, protons, or neutrons
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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