The lanthanide does not show +4 oxidation state is:
Option: 1 Tb Option: 2 Tb Option: 3 Tb Option: 4 Tb Option: 5 Ce Option: 6 Ce Option: 7 Ce Option: 8 Ce Option: 9 Eu
Option: 10 Eu
Option: 11 Eu
Option: 12 Eu
Option: 13 Dy Option: 14 Dy Option: 15 Dy Option: 16 Dy