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  4. Most of the lanthanides are coloured due to presence of unpaired electrons, which undergo

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Q. Most of the lanthanides are coloured due to presence of unpaired electrons, which undergo

The d-and f-Block Elements

Solution:

The colour of Lanthanoids and Actinoids is due to $f - f$ transitions. When one or more unpaired electrons are present in the forbital, light in the visible region is absorbed which results in f-f transition and colour.