Question

The colour of ${}_{62}S{m}^{3+}$ is yellow. The colour of ${}_{66}D{y}^{3+}$ is:

• A. colourless
• B. yellow
• C. red
• D. blue

Answer 1

The correct option is B yellow

$S{m}^{3+}-\left[Xe\right]4f^5$

$S{m}^{3+}$ has 5 unpaired electrons and it shows yellow colour.

$D{y}^{3+}-\left[Xe\right]4f^9$

$D{y}^{3+}$ also has 5 unpaired electrons and it will also show yellow colour.