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Why do the transition elements have higher enthalpies of atomisation? In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why ? |
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Answer» Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds which arise due to the presence of unpaired electron in the (n – 1) d subshell resulting in high enthalpy of atomisation. Zn has the lowest enthalpy of atomisation due to the absence of unpaired electrons and weak metallic bonds. |
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