In this video explains classification of crystalline solids

Crystalline solids are classified into four types:
1.Molecular solids
2.Ionic solids
3.Metallic solids
4.Covalent solids

Molecular solids: In these solids the constituent particles are molecules, so called molecular solids. These are again divided into three types.

Non-polar molecular solids: The constituent particles i.e., atoms ArArgon and He(helium or molecules H2 Hydrogen,I2Iodineformed by non-polar covalent bond. The particles are held by weak van der Waals forces or London forces. These are soft with low melting points, soluble in non-polar solvents with low electrical conductivity. Generally these are liquids or gases at room temperature.

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