If Aufbau rule is not obeyed and the electronic filling occurs orbit by orbit till saturation is reached (for a given principal quantum number n, electrons are filled in the increasing order of azimuthal quantum number l), then the percentage change in sum of all (n+l) values for unpaired electrons in an atom of iron is 10x. What is the value of x?

5

7

3

6

A

5

B

7

C

6

D

3

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Solution

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When n+l rule is obeyed, the configuration is

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