Which is incorrect statement?
Answer & explanation
Correct answer: option 3
Most common oxidation state for lanthanoid is +3. Oxidation numbers +2 and +4 do occur particularly when the lead to:
(1) A noble gas configuration (Ce4+)
(2) A half filled f-subshell (Eu2+ and Tb4+)
(3) A completely filled f-subshell (Yb2+)