Final answer:
Solid crystals at room temperature have a definite shape and volume. They are composed of particles in fixed positions due to intermolecular interactions. Examples include gold, silver, iron, and waxes.
Step-by-step explanation:
At room temperature, solid crystals have a definite shape and volume. They are composed of particles that are in fixed positions with respect to each other due to the intermolecular interactions, which cannot be overcome by thermal energy. Some examples of solid crystals at room temperature include gold, silver, iron, and waxes. These crystals are typically hard, although some waxes can be relatively soft. Crystalline solids have a precise melting temperature, and their particles vibrate around fixed axes.