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10.1 Classification of Solids

Solids can be broadly classified into two types: (1) Crystalline and (2) Amorphous

10.1.1 Classification of Crystalline Solids

On the basis of the nature of the constituent particles, and the inter particle forces, crystalline solids may be divided into four classes:

(a) Molecular solids (b) Covalent solids (c) Metallic solids (d) Ionic solids

Characteristic Molecular Solids Covalent Network Metallic Solids Ionic Solids

1.

Units that occupy Lattice points

Atoms or molecules

Atoms

Positive ions in a ‘sea of electrons’

Positive and negative ions

2. Binding forces

Van der Waal’s forces (weak intermolecular forces) of following two types

(i) London (dispersion)

forces

(ii)Dipole-dipole

forces

Covalent bonding

(shared pair of electrons)

Metallic bonding (extreme deloc- alised bond)–positively charged atomic cores

surrounded by ‘sea’ of delocalized electrons

ionic bonding

(electrostatic

attraction

between positive

and negative

ions)

3.

Physical properties

(i) Very soft.

(ii) Low melting

points

(iii) Non conductors

(i) Very hard

(ii) Very high melting points

(iii) Non

Conductors

(i) Hard or soft

(ii) Moderate to high melting points

(iii) Good conductors in molten state

(i) Quite hard

and brittle

(ii) Fairly high

melting

points
4. Examples Solid Ne, Solid NH3,

ice (solid H2O),

dry ice (solid CO2)
Diamond, Carborundum (SiC), quartz(SiO2) Cu, Fe, Ag NaCl, KNO3

Na2SO4

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