This question is about iron.
Iron is a metal.
Describe how iron conducts thermal energy.

Metals like iron have a giant metallic lattice structure. This structure consists of a regular arrangement of positive metal ions surrounded by a 'sea' of delocalised electrons. These electrons are not associated with any single atom and are free to move throughout the entire structure. When one end of an iron bar is heated, the delocalised electrons at that end gain kinetic energy and move faster. They then travel through the lattice, colliding with other electrons and the positive ions, transferring the kinetic energy rapidly. This process allows thermal energy to be conducted efficiently from the hot end to the cold end.