Question

How would you account for the following?

All scandium salts are white.

Answer 1

1. Scandium salts are white because scandium forms Sc³⁺ ions with an empty d-orbital (electronic configuration 3d⁰).
2. The absence of d-d electronic transitions means no colors are produced in their compounds.
3. Additionally, the salts are ionic and lack any charge transfer bands that could cause coloration.

Therefore, all scandium salts appear white due to these electronic and structural features.