Classification Of Crystalline Solids Video Lecture | Additional Study Material for Class 12

classification of crystalline solids
crystalline solids are classified into
four types one molecular solids - ionic
solids three metallic solids four
covalent solids crystalline solids are
classified into four types based on the
nature of intermolecular forces existing
between the Constituent particles one
molecular solids in this solids the
Constituent particles are molecules so
called molecular solids these are again
divided into three types a nonpolar
molecular solids be polar molecular
solids see hydrogen bonded molecular
solids a nonpolar molecular solids the
constituent particles that is atoms air
argon and etching helium are molecules
h2 hydrogen I do
iodine form by nonpolar covalent bond
the particles are held by we Vander Waal
forces or London forces these are soft
with low melting points soluble in
nonpolar solvents with low electrical
conductivity generally these are liquids
or gases at room temperature example
here are gone HG helium cl2 chlorine h2
hydrogen I - iodine o - oxygen etc be
polar molecular solids the
particles are formed by polar covalent
bond the particles are held together by
strong dipole movement some are soluble
in polar and some in nonpolar solvents
with low electrical conductivity these
are also liquids or gases at room
temperature example HCl hydrochloric
acid so2 sulfur dioxide carbon dioxide
etc
see hydrogen-bonded molecular solids the
Constituent particles are molecules
which are held together by strong
hydrogen bond generally these are soft
with slightly high melting points and
non conductors of electricity example
h2o water HF hydrogen fluoride