• # question_answer The common oxidation state of the elements of lanthanide series is A)  +1                             B)  +3C)  +2                D)  +4

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].