Question

what is free electron?​

Answer 1

Free electron is that which is not taking part in bonding .

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Answer 2

Answer:

(1) Every atom of a metallic conductor has one or more outermost electrons which are very  weakly bound to nucleus.

(2) These are called free electrons.

(3) These electrons can easily move from one part of a conductor to its other parts.

The negative charge of the electrons also gets transferred as a result of this motion. The free electrons in a conductor are the carriers of negative charge.