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Metallic can be defined as a sea of electrons moving freely throughout the metallic crystal structure of the metal.

Metals are characterized by low electro negativity. This low electro negativity means that the metallic atoms do not have a strong attraction for the valance electrons of the element. Because the electrons are not held tightly by the nuclei of the atoms the electrons are free to move.

Electricity is caused by the movement of electrons. In metals the electrons are able to move causing electricity.

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