ABCDMA ABCDMA last edited by
@ABCDMA-ABCDMA Colour of the ions depend upon the number of unpaired electrons.
As f sub-shell can have a maximum of 14 electrons, xf and (14−x)f, both will have the same number of unpaired electrons for transition. Hence, they both show same colour.
Therefore, the lanthanide element with (14−x)f electrons will also have a pink colour.