General Chemistry

Why Are Zinc ²⁺ Salts Colorless?

Zinc salts, specifically those containing the ion, are colorless due to their electronic configuration.

The electronic configuration of a ion is:

This configuration shows a completely filled subshell, with no unpaired electrons.

In transition metal ions, color typically arises from electronic transitions—when electrons jump between split -orbital energy levels by absorbing visible light. However, in , these transitions are not possible because:

• The -orbitals are fully filled.
• No vacant -orbitals are available for electron transitions.

As a result, ions do not absorb visible light, and their salts appear colorless in solution.