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Answer:
b) A disordered arrangement of atoms or molecules
Explanation:
The most important characteristics of amorphous solids are that they: (1) do not have long-range, regular atomic order, (2) form irregular shapes, (3) soften over a range of temperatures depending on their composition and thermal history, (4) fracture in irregular, unpredictable patterns (e.g., conchoidal fracture), (5) do not produce characteristic, sharp, diffraction patterns due to the lack of regular, symmetric crystal planes, (6) tend to deform in irregular, unpredictable ways due to the lack of regular internal structure, (7) are isotropic. That is, their properties such as electrical and thermal conductivity, refractive index, and mechanical strength are uniform within the material due to the lack of a regular atomic structure.