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C401Ch20LN2 - between the metal’s d-electrons and the...

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Chapter 20: Transition Metals Coordination Compounds Part 2 Transition Metals The transition metals include the d-block, Groups 3-12. The inner transition metals include the f-block elements. Many transition metals form beautifully colored solids and solutions. Why are so many transition metal complexes colored? Usually only metals with d 0 or d 10 form colorless compounds (Zn, Ag). Colors in metal complexes (or any compound) is due to their absorption spectrum. When a metal complex absorbs light, an electron undergoes an electronic transition from a ground state to an excited state. Remember: ± E = h c/ ² OR ² = h c/ ± E We see the color which is NOT absorbed, but which was reflected or transmitted. We see the complementary color of what was absorbed.
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