Chemistry Transition Elements SZABMU 2022
PMDC Verified Question 30 of 68
The binding energy of transition metals increases upto group:
A
II B
B
IV B
C
III B
D
VI B
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: VI B
Concept:

Binding energy in transition metals is related to the strength of metallic bonding, which in turn relies on the number of unpaired \(d\)-electrons available to participate in the "electron sea" lattice.

Solution:

  • As you move across a transition series from Group III B (Sc) to Group VI B (Cr), the number of unpaired \(d\)-electrons steadily increases from 1 to 5.


  • More unpaired electrons mean stronger interatomic metallic bonds. Therefore, binding energy peaks at Group VI B (Chromium, Molybdenum, Tungsten).


  • After Group VI B, electrons begin to pair up, reducing the number of available unpaired electrons and subsequently weakening the metallic bonding.


Why other options are incorrect:

  • Groups II B and III B have very few unpaired electrons, resulting in lower binding energies.

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