sic is the example of dash crystal
Answers
Answer:
ANSWER
Types of Solids Constituent Bonding/Attra-
ctive Force Examples Physical
Nature Electricalconductivity Melting point
1. Molecular
Solids
(i) Non-polar
(ii) Polar
(iii) Hydrogen
bonded Molecules Dispersion or
London forces
Dipole - dipole
interactions
hydrogen
bodning Ar,CCl
4
,
H
2
l
2
,CO
2
HCl,SO
2
H
2
O (ice) SoftSoft
Hard Insulator
Insulator
Insulator Very low
Low
Low
2. Ionic solids lons Coulombic or
electrostatic NaCl,MgO,ZnS,CaF
2
Hard but
britte Innsulator s in
solid state but
consuctors in
molten state
and in
aqueous
solutions High
3. Metallic
solids Positive ions in a sea of
delocallised
electorns Metallic
bonding Fe,Cu,AgMg Hard but malleable
and suctile Conductrons
in solid state as well as in
molten state Fairly high
4. Covalent or
network solids Covalent or
network
solids atoms Covalent
bonding SiO
2
(quart-z) SiC,C
(diamond),
AIN
C(graphite) Hard
Soft Insulators
Condutor
(exception)