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
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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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