Which of the following oxidation state is common for all lanthanoids?

1. +2 2. +3
3. +4 4. +5
NEETprep Answer: Lanthanoids show a common oxidation state of +3. Some of which also show +2 and +4 stable oxidation states along with +8 oxidation state. These are shown by those elements which by losing 2 or 4 electrons acquire a stable configuration of f0,f7orf14,e.g.,Eu2+isXe4f7,Yb2+isXe4f0andTb4f0 and Tb4lisXe4f7.