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Answer:
- The colour of lanthanides ions is due to the presence of partly filled & orbitals. As a result, it is possible to absorb certain wavelengths from the visible region of the spectrum. This result in a transition from 4F orbital to another 4F orbital known as the F – F transition.
- Such unpaired F electrons give colour to the elements.
- Lanthanides ions are classified as “rare earth elements”.
