MCQ
The CORRECT order of decreasing ionic radius is:
- ✓$La ^{3+}> Pr ^{3+}> Gd ^{3+}> Tm ^{3+}$
- B$Tm ^{3+}> Pr ^{3+}> Gd ^{3+}> La ^{3+}$
- C$La ^{3+}> Pr ^{3+}> Tm ^{3+}> Gd ^{3+}$
- D$La ^{3+}> Gd ^{3+}> Pr ^{3+}> Tm ^{3+}$
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