Which is incorrect statement?

Lanthanoids do not form oxoions. Actinoids form oxoanions like UO22+, PuO22+, UO22+ etc. Lanthanoids show oxidation states of +3, +4, +5, +6 and +7. Actinoids have more tendency to form complex compounds than lanthanoids.

Lanthanoids show oxidation states of +3, +4, +5, +6 and +7.

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+)