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From the given options, the only correct combination is Ni²⁺ and Ti³⁺.

1. Sc³⁺ -> 3d⁰4s⁰
2. Fe²⁺ -> 3d⁶4s⁰
3. Ti³⁺ -> 3d¹4s⁰
4. Mn²⁺ -> 3d⁵4s⁰

Correct answer: Ti³⁺ -> 3d¹4s⁰

Solution

Ti³⁺ has lost three electrons, leaving it with a 3d¹ configuration as the 4s electrons are removed first, followed by one 3d electron.

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