lanthanides (rare earth) 
Lanthanoide (Seltenerdmetalle) 
erbium 
Erbium 
ytterbium 
Ytterbium 
thulium 
Thulium 
lutetium 
Lutetium 
dysprosium 
Dysprosium 
holmium 
Holmium 
terbium 
Terbium 
samarium 
Samarium 
promethium 
Promethium 
neodymium 
Neodym 
praseodymium 
Praseodym 
cerium 
Cer 
gadolinium 
Gadolinium 
europium 
Europium 
lanthanum 
Lanthan 