Which property explains why Sc3+ and Zn2+ ions form colorless solutions in water?
Answer and explanation
Correct answer: C. They have completely empty (3d^0) or completely filled (3d^10) d-subshells
- Step 1: d-d transitions require partially filled d-orbitals (3d^1 to 3d^9). Step 2. Sc3+ has 3d^0 (no d-electrons to promote) and Zn2+ has 3d^10 (no vacant d-orbital to receive an electron), making both completely colorless. Answer: They have completely empty (3d^0) or completely filled (3d^10) d-subshells. Why not the others: Scandium Z=21 and Zinc Z=30 are within standard range; their salts are highly soluble; both coordinate 6 water molecules readily.
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