Question

Which of the following is the correct electron configuration for the ion \(\text{Fe}^{3+}\)?

• A. [Ar] 3d\(^5\)
• B. [Ar] 3d\(^6\)
• C. [Ar] 4s\(^2\) 3d\(^3\)
• D. [Ar] 3d\(^8\)

Hint:

When an atom forms a positive ion, electrons are removed starting from the outermost orbitals, typically 4s before 3d.