Some substances are extended structures, made up of billions of tightly packed atoms or molecules. Which of the following are extended structures?

A molecule of vitamin C is made up of 20 atoms. That may sound like it is a pretty large molecule, however, it is actually millions of times smaller than the period at the end of this sentence. In fact, it is actually one of the smaller molecules in the world! Each molecule of vitamin C consists of atoms of carbon, hydrogen, and oxygen. The specific numbers of each type of atom and the particular ways they are attached to one another make vitamin C an important part of a nutritious diet.

Explanation: