Metallic Bonding

1
Metallic Bonding

• Section 6-4

2
Metallic-bond Model

• Metals have unique properties, so a different
  model of bonding is needed.
• Metals have few valence electrons, the p-block is
  usually empty.

3
Metallic-bond Model

• Electrons are free to roam in the overlapping
  vacant orbitals.
• They are delocalized, they do not belong to any
  one atom.
• This sea of electrons surrounds the metal atoms
  in a crystal lattice.

4
Metallic Bonding

• The chemical bonding that results from the
  attraction between metal atoms and the
  surrounding sea of electrons.

5
Metallic Properties

• The freedom of the electrons accounts for
• High conductivity
• Shiny luster
• Malleability
• Ductility

6
Metallic Bond Strength

• Measured using heat of vaporization
• The higher the Hvap the stronger the metallic
  bond.
• Varies with nuclear charge and number of
  electrons.