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Question 600244
JEE Chemistry · Hard

Atomic Structure: Configuration MCQ

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ConfigurationHardQuestion 600244

Question

Which ion has the configuration [Ar] 3d⁵?
  1. A
    Mn²⁺
  2. B
    Fe³⁺
  3. C
    Cr³⁺
  4. D
    Both A and B
    Correct

Correct answer

Both A and B

Explanation

Mn (Z=25): [Ar] 3d⁵ 4s². Mn²⁺: remove 4s² → [Ar] 3d⁵. Fe (Z=26): [Ar] 3d⁶ 4s². Fe³⁺: remove 4s² and one 3d → [Ar] 3d⁵. Both are [Ar] 3d⁵.

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