Molecular crystals:
i. The constituent particles of molecular solids are molecules of the same substance.
ii. The bonds within the molecules are covalent. The molecules are held together by various intermolecular forces of attraction.
a. Weak dipole-dipole interactions in polar molecules such as solid HCI, H_{2}*O, S*O_{2} which possess permanent dipole moment.
b. Very weak dispersion or London forces in nonpolar molecules such as solid CH, H. These forces are also involved in monoatomic solids like argon, neon.
c. Intermolecular hydrogen bonds in solids such as H,O (ice), NH,, so forth.
iii. Because of weak intermolecular attractive forces, molecular solids are usually soft substances with low melting points.
iv. These solids are poor electrical conductors and are good insulators.
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