Arrange \( \mathrm{Ce}^{+3}, \mathrm{La}^{+3}, \mathrm{Pm}^{+3} \), and \( \mathrm{Yb}^{+3} \) i...
Arrange \( \mathrm{Ce}^{+3}, \mathrm{La}^{+3}, \mathrm{Pm}^{+3} \), and \( \mathrm{Yb}^{+3} \) in increasing order of their ionic radii:
(a) \( \mathrm{Yb}^{+3}\mathrm{Pm}^{+3}\mathrm{Ce}^{+3}\mathrm{La}^{+3} \)
(b) \( \mathrm{Yb}^{+3}\mathrm{Pm}^{+3}\mathrm{La}^{+3}\mathrm{Ce}^{+3} \)
(c) \( \mathrm{La}^{3+}\mathrm{Ce}^{3+}\mathrm{Yb}^{3+}\mathrm{Pm}^{3+} \)
(d) \( \mathrm{Pm}^{+3}\mathrm{La}^{+3}\mathrm{Ce}^{+3}\mathrm{Yb}^{+3} \)
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