Lanthanum and lutetium do not show colouration in solution. Why?
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Lanthanum(La 3+) have 4f ^0 and lutetium (Lu 3+) have 4f^14 configuration. Because of the absence of an unpaired electrons , these ions impart no colour to the solution.
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Answer:
None of them have vacant d orbital for d-d transition, so no colour is expressed.
Explanation:
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