Can an extended structure be made up of many molecules?
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Yes

Explanation:

The unit is repeated in the same arrangement over and over throughout the entire pure substance. These extended structures are different from molecules and can be compounds or elements. For example, table salt has an extended structure that is made up of two types of atoms, sodium and chlorine.

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

the volume increases