Final answer:
An iron nail is made up of particles called atoms, which are arranged in a regular pattern forming a crystal structure. The iron atoms in the nail are held together by metallic bonds.
Step-by-step explanation:
An iron nail is made up of particles called atoms.
In iron, the atoms are arranged in a regular pattern, forming a crystal structure.
The iron atoms in the nail are held together by metallic bonds, which occur when the metal atoms share their outer electrons.