Question

This is a solid in which the basic unit is packed in an ordered, repeating pattern.

Answer 1

The description you're providing sounds like it refers to a **crystalline solid**. In crystalline solids, the basic unit, known as the unit cell, is arranged in a highly ordered, repeating pattern throughout the entire structure. This regular arrangement gives crystalline materials distinct properties, such as well-defined melting points and specific geometric shapes. Examples of crystalline solids include table salt (sodium chloride), diamond, and quartz.