Q.Give two differences between Crystalline and Amorphous solids.

Crystalline = long-range order, sharp m.p., anisotropic; amorphous = short-range order, no sharp m.p., isotropic.

Crystalline and amorphous solids differ in how their constituent particles are arranged:

1. Arrangement of particles:

• Crystalline solids have a regular, long-range, repeating three-dimensional arrangement (e.g. NaCl, diamond).

• Amorphous solids have particles arranged in an irregular way, showing order only over short distances (e.g. glass, rubber).

2. Melting behaviour:

• Crystalline solids have a sharp and characteristic melting point.
• Amorphous solids gradually soften over a range of temperature and do not have a definite melting point. …