Which ion has the configuration 3d³?
Correct answer C. Cr³⁺
Explanation
Chromium is [Ar]3d⁵4s¹. Losing the 4s electron and two 3d electrons gives Cr³⁺ = [Ar]3d³. V³⁺ is 3d², Mn²⁺ is 3d⁵ and Ti³⁺ is 3d¹.
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