Provide an example of the types of metal crystal structures.

There are four main types of metal crystal structures: body-centered cubic, face-centered cubic, hexagonal close-packed, and simple cubic.

Body-centered cubic (BCC) metals have atoms arranged in a cubic lattice with one atom at each corner and one in the center of the cube. Examples of BCC metals include iron, chromium, and tungsten.

Face-centered cubic (FCC) metals have atoms arranged in a cubic lattice with one atom at each corner and one in the center of each face. Examples of FCC metals include copper, silver, and gold.

Hexagonal close-packed (HCP) metals have atoms arranged in a hexagonal lattice with each atom surrounded by six others. Examples of HCP metals include magnesium, titanium, and zinc.

Simple cubic (SC) metals have atoms arranged in a simple cubic lattice with one atom at each corner. Examples of SC metals include polonium and chromium.

The crystal structure of a metal can affect its physical and chemical properties, such as its strength, ductility, and conductivity. Understanding the crystal structure of a metal is important in materials science and engineering, as it can help predict how a metal will behave under different conditions.