A) the energies of 5f and 6d orbitals are very close
B) actinides are good reducing agents
C) the 5f orbitals are more diffuse than 4f orbital
D) of high charge/size ratio of actinide ions
Correct Answer: D
Solution :
Compared to the lanthanides, the actinides have higher charge and smaller size of their ions, so, the tendency to form complex is greater than that of the lanthanides.
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