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Metallic bonding happens when there is an electrostatic attractive forces happening among the delocalized valence electrons thus forming a "sea of electrons" called electron cloud.
The moving (mobile) electrons are responsible for the ability of metals to be bent because they maintain the electrostatic attraction while a force is applied.
It is true that the moving electrons are responsible for the conductive capabilities of metals. They acts as charge carriers which brings the electricity from one end to the other that make metals become efficient for wiring systems.
Steel is an alloy combining iron with other elements such as carbon to make the metal stronger.