Which transition metal ion forms a colored aqueous solution due to partially filled d-orbitals?
Answer and explanation
Correct answer: A.
- Step 1: Aqueous transition metal ions are colored when d-d electronic transitions occur, requiring partially filled d-orbitals ( to ).
- Step 2: has electron configuration , which is partially filled, yielding a characteristic blue solution.
- Step 3: (), (), and () have empty or completely filled d-subshells and are colorless.
Answer
\text{Cu}^{2+}.
Why not the others: '' has an empty configuration; '' has a completely filled configuration; '' has an empty configuration.
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