A) +1
B) +3
C) +2
D) +4
Correct Answer: B
Solution :
The elements which are partly filled by orbitals are called lanthanides or lanthanones. The elements from cerium (58) to Lutetium (71) are lanthanides. Their general electronic configuration is \[(n-2){{f}^{1/14}}(n-1){{d}^{0-2}}n{{s}^{1-2}}.\]Lanthanides show variable oxidation states but + 3 is their most stable and important oxidation state. Hence, the correct option is [b].
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