For the Lanthanides
A. Lanthanides display only the (+3) oxidation state.
B. Oxidation numbers (+2) and (+4) occur when they lead to a noble gas configuration.
C. Oxidation numbers (+2) and (+4) are observed when they lead to a half-filled orbital.
D. Yb2+ has a completely filled f-orbital.
Choose the correct answer from the options given below :
1
A only
2
B and C only
3
C and D only
4
B, C and D only