This chemistry video tutorial provides a basic introduction into metallic bonding and the electron sea model. The valence electrons in the metal are delocalized - they are free to move around stationary metal cations. This explains the electrical conductivity of metals. A substance with free flowing charge can conduct an electric current. The charge carrier in metals are valence electrons. The core electrons in metals atoms are localized - they are bound to their respective atoms and are not free to move from one metal atom to another.
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