AP EAMCET · Chemistry · d and f Block Elements

The electron configuration of $F e^{3 +}$ is (atomic number of $F e = 26$ )

A $[A r] 3 d^{5} 4 s^{1}$
B $[A r] 3 d^{6} 4 s^{0}$
C $[A r] 3 d^{5} 4 s^{0}$
D $[A r] 3 d^{6} 4 s^{2}$

Verified Solution

Answer & Solution

Correct Answer

(C) $[A r] 3 d^{5} 4 s^{0}$

Step-by-step Solution

Detailed explanation

We know that atomic number of Fe is 26 and its a d- block element and it belongs to 4th period and 8th group also the general electronic configuration for d-block elements is (n−1)d1−10ns1−2 where n is the period number. So, for the ferrous atom the…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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The electron configuration of Fe3+ is (atomic number of Fe=26)

Step-by-step Solution

The electron configuration of $F e^{3 +}$ is (atomic number of $F e = 26$ )