Question

If a lanthanide element with $xf$ electrons has a pink colour, then the lanthanide with $(14-x)f$ electrons will have _____ colour.

• A. blue
• B. red
• C. green
• D. pink

Answer 1

The correct option is D pink

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.