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In , the are free to move throughout the metal structure.
This accounts for many of the properties of metals.
The mobile electrons can act as charge carriers in the conduction of electricity and as energy carriers in the conduction of heat.
Metals tend to have have high melting and boiling points. There are strong electrostatic attractions between the giant lattice of cations and the sea of delocalized electrons.
This means that it takes a lot of energy to overcome these forces during melting and boiling.
Delocalized electrons readily absorb and re-emit visible light. This gives metals their characteristic lustre.
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