Conductivity in metallic solids is due to the presence of free electron. No of the electron will decide the flow of the electric current.
What is the charge?
When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.
Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term “neutral” refers to an item that has no net charge.
A valence electron is an electron in the outermost shell. Hence, associated with an atom that can experience the innovation of a chemical bond if the outer shell is not closed.
Conductivity in metallic solids is due to the presence of free electron.
Hence, electron is the correct answer for blank.
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