What is the primary reason for the color of transition metal compounds?

What is the primary reason for the color of transition metal compounds?

Step 1: Understand that transition metals have electrons in their d-orbitals.
Step 2: Know that some of these d-orbital electrons are unpaired, meaning they are alone in their orbital.
Step 3: When light hits these transition metal compounds, energy can be absorbed by the unpaired electrons.
Step 4: This energy causes the unpaired electrons to jump from a lower energy d-orbital to a higher energy d-orbital. This is called a d-d transition.
Step 5: The specific colors we see are due to the particular wavelengths of light that are absorbed during these transitions.
Step 6: The remaining light that is not absorbed is what we perceive as the color of the compound.

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