Answer:
The crystalline structure of the solid
Step-by-step explanation:
The third law of thermodynamics has to do with entropy. It states that the entropy of a perfectly ordered crystal lattice is zero at the absolute zero temperature.
Let us be reminded that entropy is the degree is disorderliness in a system. Hence, atoms of a crystal lattice stop moving as the system approaches absolute zero, the entropy also tends to a constant value.
This clearly shows that the crystalline structure of a solid material determines the degree of entropy of the solid.