All the transition elements exhibit typical metallic properties
such as –high tensile strength, ductility, malleability, thermal and electrical conductivity
and metallic character Their melting and boiling points are high which are attributed
to the involvement of (n –1) d electrons resulting into strong interatomic bonding In
many of these properties, the maxima occur at about the middle of each series which
indicates that one unpaired electron per d orbital is particularly a favourable configuration
for strong interatomic interaction Successive ionisation enthalpies do not increase as steeply as in the main group
elements with increasing atomic number