Q 9 Explain
(i) The basis of similarities and differences between
metallic and ionic crystals.
(ii) Ionic solids are hard and brittle.
(i)
The constituent particles of both metallic and ionic crystals are held by
strong electrostatic force of attraction. In metals there is strong force of
attraction between the mobile electron and positively change ions. In ionic
crystals there are strong force of attraction between anion and cation. As both
types of crystals have strong force of attraction so there melting and boiling
points are high. Metal have free mobile electron so they conduct electricity in
all there phase while ionic compound conduct electricity at molten or aqueous
state only.
(ii)
The
constituent particles of ionic compound are held by strong electrostatic force
of attraction. In ionic crystals there are strong force of attraction between
oppositely changed anions and cations. As the electrostatic
force of attraction is very strong so that the charged ions are held in fixed
positions and they cannot move easily . This is the reason of ionic crystals to
be hard and brittle.
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