What is the chemical bonding of gold?

Metallic Bonding

Gold forms metallic bonds, which are bonds between positive metal ions and a “sea” of delocalized electrons.

In metallic bonding:

• The metal atoms lose their outermost electrons, becoming positive ions.
• The lost electrons are shared collectively between the ions, forming an electron “cloud”.
• The attraction between the positive ions and shared electron cloud forms the metallic bond.

This pooling of electrons is what gives metals like gold their high electrical and thermal conductivity.

Bonding Forces

The metallic bonds in gold are relatively strong compared to other metals. This is due to:

• High number of protons in the gold nucleus providing stronger attraction for electrons.
• Completely filled 5d and 6s subshells, which are stable electron configurations.
• Relativistic effects – contractions of the s and p orbitals near the heavy gold nucleus.

These factors make electron removal very difficult and underlie gold’s chemical stability.

Properties from Metallic Bonding

Gold’s metallic bonding and resulting properties include:

• High thermal and electrical conductivity
• Malleability – thin gold foil or sheets can be hammered out.
• Ductility – gold can be drawn into long thin wires.
• Resistance to corrosion and oxidation

In summary, gold’s metallic bonds arising from its electron configuration and nuclear properties give it unique chemical stability and useful physical properties. The shared electrons freely move, conducting heat and electricity, while the ions provide a firm yet malleable structure.