Transition metals have high enthalpies of atomization.
due to variable unpaired valence electrons present in the series the enthalpy of atomisation is high;
and Mg^2+ has the maximum enthalpy of atomization and Zn^2+ has the minimum enthalpy of atomization ;
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Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds. As a result, the enthalpy of atomization of transition metals is high.
OR Enthalpy of atomisation is directly proportional to lone pair of electrons in its valence shell.
#. The enthalpies of atomisation of the elments in the first transition series are lower than those of the correspondingl elements in the seconde and third transion series.