Metallic Bonds

• Metallic bonding is the force of attraction between valence electrons and the metal ions. It is the sharing of many detached electrons between many positive ions, where the electrons act as a "glue" giving the substance a definite structure.

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• A metallic bond is a sharing of electrons between many ions of a metal element.

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• Think of them as positive ions floating in a

sea of electrons.

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Metallic Bond Properties from Electrons

• Freedom of electron movement in metallic bonding explains:

Thermal conductivity (conduct heat) – electrons are free to move and transfer the heat between each other

Electrical conductivity – electrons are free to move (electricity is basically just the movement of electrons)

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Metallic Bond Properties from positive ions

• Freedom of positive ions to move around in metallic bonding explains:

Malleability - The ability to beat metals into a flat sheet occurs because the positive atoms are free to move past each other

Ductility - The ability to draw metals into a wire occurs because the positive atoms are free to move past each other

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Metallic Bonding Questions

1. True or false: Metals give up electrons easily.

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• Because the electrons in a metallic solid are ________, the metal can be bent into shapes or drawn into wire.

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• What is it called when a metal can be drawn into wire?

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• True or false: Because of the mobile electron clouds in metallic solids, metals can conduct electricity.

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• What is it called when a metal can be hammered or bent into shapes?

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• True or false: Because of the mobile electron clouds, metals cannot conduct heat

Scroll down to chapter 6.

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