Even-though Ce⁺³ and Yb⁺³ possess unpaired electrons in their subshells, they do not exhibit any color i.e. they are colorless. Why?
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the colour of lanthanide ions due to f-f transition from one 4f to another 4f orbital.
number of unpaired electron ions in Ce3+ and Yb3+ is 1 and no f-f transition for the f1 and f13 as there no 4f upper state so they absorb in the visible region and appear colourless .
number of unpaired electron ions in Ce3+ and Yb3+ is 1 and no f-f transition for the f1 and f13 as there no 4f upper state so they absorb in the visible region and appear colourless .
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Answer: Among the +3 ions in lanthanoids ce gd yb lu have no colour
ce+3 has the configuration 4f1 5d0, the electron exites from the 4f to 5d shell to gain partial stable inert gas configuration and this transition does no take place in the visible region, so we do not see any colour.
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