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JIPMER 2005
Exam
JIPMER
Year
2005
Subject
Chemistry
Chapter
d and f Block Elements

JIPMER 2005 · Chemistry · d and f Block Elements

The incorrect configuration is

The incorrect configuration is

Options

  1. AK=[Ar]4s1\mathrm{K}=[\mathrm{Ar}] 4 s^1
  2. BCr=[Ar]3d54s1\mathrm{Cr}=[\mathrm{Ar}] 3 d^5 4 s^1
  3. CCr=[Ar]3d44s1\mathrm{Cr}=[\mathrm{Ar}] 3 d^4 4 s^1
  4. DCu=[Ar]3d104s1\mathrm{Cu}=[\mathrm{Ar}] 3 d^{10} 4 s^1

Correct answer

C. Cr=[Ar]3d44s1\mathrm{Cr}=[\mathrm{Ar}] 3 d^4 4 s^1

Step-by-step solution

The correct configurations of K,Cu\mathrm{K}, \mathrm{Cu} and Cr are [Ar]4s1,[Ar]3d104s1,[Ar]3d54s1[\mathrm{Ar}] 4 s^1,[\mathrm{Ar}] 3 d^{10} 4 s^1,[\mathrm{Ar}] 3 d^5 4 s^1 respectively. As half filled and completely filled d orbitals are more stable, hence in case of Cr and Cu one electron shifts from 4s4 s orbital to 3d3 d orbital to give them stable electronic configuration.
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