Transition and Inner Transition Elements — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryTransition and Inner Transition Elements2 Marks
Question
Explain why $Gd ^{3+}$ is colourless.
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Answer
$Gd^{3+}$ has electronic configuration, $[Xe] 4f^7$
Due to extra stability of half filled orbital, it does not allow $f \rightarrow f$ transition, and hence does not absorb radiations in the visible region.
Hence $Gd^{3+}$ is colourless.
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