Why do transition metals make such colorful compounds?
Quick Answer
Transition metals often have partially filled d-orbitals that absorb specific wavelengths of light. The remaining light is what gives their compounds vivid colors.
The Full Story
Transition metals such as copper, iron, cobalt, nickel, and chromium sit in the central block of the periodic table. Their ions often have electrons in d-orbitals that can absorb visible light when light energy shifts electrons between energy levels. Because different compounds absorb different wavelengths, the colors vary widely from blue copper sulfate to purple permanganate solutions. This is one reason transition metals are so important in pigments, catalysts, and biological molecules.
Key Facts
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"Why the middle of the periodic table is the rainbow section."
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