4 - METALLIC BONDING
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Metals form giant structures in which electrons in the outer shells of the metal atoms are free to move.
The metallic bond is the force of attraction between these free-moving (delocalised) electrons and positive metal ions.
PROPERTIES OF METALS
Metallic bonds are strong.
Most metals are malleable – they can be bent and shaped without breaking. This is because they consist of layers of ions that can slide over one another when the metal is bent, hammered or pressed.
Most metals are ductile (they can be drawn/pulled into wires, making them suitable for electric cables) due to the ions sliding over each other,
They usually have high melting and boiling points. This is due to the increased positive charge on the metal ion and the increased number of electrons that are delocalised, resulting in stronger bonding.
Metals are good conductors of electricity and heat. This is because the delocalised electrons can move throughout the metal.
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