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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 40
Total: 49
In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ mol‌–1. Why?
Solution:  
In the formation of metallic bonds, no electrons from 3d-orbitals are involved in case of zinc, while in all other metals of the3d-series, electrons from the d-orbitals are always involved in the formationof metallic bonds.
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