Question
Explain $:$ The compounds of $Cu(II)$ are coloured.
✓
Answer
- The electronic configuration of ${ }_{29} Cu [ Ar ] 3 d ^{10} 4 s ^1$ and $Cu ^{2+}[ Ar ] 3 d ^9$.
- In copper compounds $Cu^{2+}$^ ions have incompletely filled $3d-$orbital $(3d^9).$
- Due to the presence of one unpaired electron in $3 d-$orbital, $Cu^{2+}$ ions absorb red light from visible spectrum and emit blue radiation due to $d \rightarrow d$ transition. Therefore, copper compounds are coloured.
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