Question
Why do transition elements form coloured compounds explain?
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Answer
Transition elements and their compounds form coloured ions and complexes because they have incomplete $d$-sub-sell and due to the approach of anions $d$-orbitals of transition metals split into 2 sets of lower and higher energy so electrons absorb certain amount of energy and jump into orbitals of higher energy. To gain energy they absorb certain radiations from visible light and emit out the remainder as coloured light. So they look coloured.
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→| Column I | Column II | ||
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