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Question

Which among d block elements have lowest boiling point and highest boiling point?

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Solution

d-block elements with more number of unpaired e have high boiling points as more is the number of unpaired e, stronger is the metallic bonding which results in high enthalpy of atomization. Thus more amount of heat is required to weaken these metallic bonds. Hence having a high boiling point.
So, Chromium with electronic configuration 4s13d5 having 5 unpaired es will have the highest boiling point due to the formation of stronger metallic bonds.
On the other hand, Zn and Hg have lowest boiling point due to the absence of unpaired d-es.

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