Exam Frequency Analysis
Past paper frequency (2018 to 2024)
This topic accounts for approximately 5% of your exam marks.
stable
Rare
Stable5%
Shorter-answer topic; typically tested alongside ionic and covalent bonding comparisons.
Metals as giant lattices
- A metal is a giant metallic lattice of metal atoms packed in a regular arrangement
- Each atom releases its outer-shell electrons into the lattice
- These electrons are no longer attached to any single atom
- They are described as delocalised electrons
- They move freely throughout the whole lattice, forming a sea of electrons
- What remains at the lattice positions are the positive metal ions (cations)
What the metallic bond is
- The metallic bond is the electrostatic attraction between the positive metal ions and the surrounding delocalised electrons
- The attraction acts in every direction through the lattice and holds the whole structure together
- The same bonding model applies to pure metals and to alloys, which are mixtures of a metal with one or more other elements
