Question

If Aufbau rule is not obeyed and the electronic filling occurs orbit by orbit till saturation is reached (for a given principal quantum number , electrons are filled in the increasing order of azimuthal quantum number ), then the percentage change in sum of all values for unpaired electrons in an atom of iron is . What is the value of ?

A

B

C

D

Hard
Updated on : 2022-09-05
Solution
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Correct option is A)

When rule is obeyed, the configuration is 



Since, for each unpaired electron is , so for unpaired electrons in , is .

When rule is not obeyed, the configuration is 



Since,  for each unpaired electron is , so for unpaired electrons in , is .

Now,
% change .

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