Metals have many more empty orbits than electrons available to fill them. For example, iron requires 5 electrons to fill its outermost 3d orbital.
Metallically bonded solids share the following properties: low to moderate hardness, malleability, and ductility (weak delocalized bonds); very good thermal conductivity and electrical conductivity (free electrons in cloud); and form crystals with high symmetry (nuclei pack well).
Related categories CHEMICAL BONDING
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